Management's Discussion and Analysis of Financial Condition and Results of
Operations should also be read in conjunction with the unaudited consolidated
financial statements and accompanying footnotes included under Item 1. Financial
Statements and in conjunction with our Annual Report on Form 10-K for the year
ended December 31, 2022.

Disclosures Regarding Forward-Looking Statements



This Quarterly Report on Form 10-Q, particularly Management's Discussion and
Analysis of Financial Condition and Results of Operations and Quantitative and
Qualitative Disclosures about Market Risk, includes forward-looking statements
that are subject to risks, contingencies or uncertainties. You can identify
forward-looking statements by words such as "anticipate," "believe,"
"commitment," "could," "design," "estimate," "expect," "forecast," "goal,"
"guidance," "intend," "may," "objective," "opportunity," "outlook," "plan,"
"policy," "position," "potential," "predict," "priority," "project,"
"prospective," "pursue," "seek," "should," "strategy," "target," "will," "would"
or other similar expressions that convey the uncertainty of future events or
outcomes.

Forward-looking statements include, among other things, statements regarding:

•future financial and operating results;

•environmental, social and governance ("ESG") plans and goals, including those related to greenhouse gas emissions, diversity and inclusion and ESG reporting;

•future levels of capital, environmental or maintenance expenditures, general and administrative and other expenses;

•the success or timing of completion of ongoing or anticipated capital or maintenance projects;

•business strategies, growth opportunities and expected investments;

•the timing and amount of future distributions or unit repurchases; and

•the anticipated effects of actions of third parties such as competitors, activist investors, federal, foreign, state or local regulatory authorities, or plaintiffs in litigation.



Our forward-looking statements are not guarantees of future performance and you
should not rely unduly on them, as they involve risks, uncertainties and
assumptions. Forward-looking and other statements regarding our ESG plans and
goals are not an indication that these statements are material to investors or
required to be disclosed in our filings with the SEC. In addition, historical,
current, and forward-looking ESG-related statements may be based on standards
for measuring progress that are still developing, internal controls and
processes that continue to evolve, and assumptions that are subject to change in
the future. Material differences between actual results and any future
performance suggested in our forward-looking statements could result from a
variety of factors, including the following:

•general economic, political or regulatory developments, including inflation,
interest rates, changes in governmental policies relating to refined petroleum
products, crude oil, natural gas, NGLs, renewables, or taxation;

•the ability of MPC to achieve its strategic objectives and the effects of those strategic decisions on us;



•further impairments;

•negative capital market conditions, including an increase of the current yield on common units;



•the ability to achieve strategic and financial objectives, including with
respect to distribution coverage, future distribution levels, proposed projects
and completed transactions;

•the success of MPC's portfolio optimization, including the ability to complete
any divestitures on commercially reasonable terms and/or within the expected
timeframe, and the effects of any such divestitures on our business, financial
condition, results of operations and cash flows;

•the adequacy of capital resources and liquidity, including the availability of
sufficient cash flow to pay distributions and access to debt on commercially
reasonable terms, and the ability to successfully execute business plans, growth
strategies and self-funding models;

•the timing and extent of changes in commodity prices and demand for crude oil, refined products, feedstocks or other hydrocarbon-based products, or renewables;



•volatility in or degradation of general economic, market, industry or business
conditions as a result of the COVID-19 pandemic, other infectious disease
outbreaks, natural hazards, extreme weather events, the military conflict
between Russia and Ukraine, other conflicts, inflation, rising interest rates or
otherwise;

•changes to the expected construction costs and timing of projects and planned investments, and the ability to obtain regulatory and other approvals with respect thereto;

•completion of midstream infrastructure by competitors;

•disruptions due to equipment interruption or failure, including electrical shortages and power grid failures;

•the suspension, reduction or termination of MPC's obligations under MPLX's commercial agreements;

•modifications to financial policies, capital budgets, and earnings and distributions;

•the ability to manage disruptions in credit markets or changes to credit ratings;


                                       22
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•compliance with federal and state environmental, economic, health and safety,
energy and other policies and regulations or enforcement actions initiated
thereunder;

•adverse results in litigation;

•the effect of restructuring or reorganization of business components;

•the potential effects of changes in tariff rates on our business, financial condition, results of operations and cash flows;

•foreign imports and exports of crude oil, refined products, natural gas and NGLs;

•changes in producer customers' drilling plans or in volumes of throughput of crude oil, natural gas, NGLs, refined products, other hydrocarbon-based products, or renewables;



•changes in the cost or availability of third-party vessels, pipelines, railcars
and other means of transportation for crude oil, natural gas, NGLs, feedstocks,
refined products, or renewables;

•the price, availability and acceptance of alternative fuels and alternative-fuel vehicles and laws mandating such fuels or vehicles;

•actions taken by our competitors, including pricing adjustments and the expansion and retirement of pipeline capacity, processing, fractionation and treating facilities in response to market conditions;

•expectations regarding joint venture arrangements and other acquisitions or divestitures of assets;

•midstream and refining industry overcapacity or undercapacity;

•accidents or other unscheduled shutdowns affecting our machinery, pipelines, processing, fractionation and treating facilities or equipment, means of transportation, or those of our suppliers or customers;

•acts of war, terrorism or civil unrest that could impair our ability to gather, process, fractionate or transport crude oil, natural gas, NGLs, refined products, or renewables;



•political pressure and influence of environmental groups upon policies and
decisions related to the production, gathering, refining, processing,
fractionation, transportation and marketing of crude oil or other feedstocks,
refined products, natural gas, NGLs, other hydrocarbon-based products, or
renewables;

•the imposition of windfall profit taxes or maximum refining margin penalties on
companies operating in the energy industry in California or other jurisdictions;
and

•our ability to successfully achieve our ESG goals and targets within the expected timeframe, if at all.

For additional risk factors affecting our business, see the risk factors described in our Annual Report on Form 10-K for the year ended December 31, 2022. We undertake no obligation to update any forward-looking statements except to the extent required by applicable law.

MPLX Overview



We are a diversified, large-cap master limited partnership formed by MPC in 2012
that owns and operates midstream energy infrastructure and logistics assets, and
provides fuels distribution services. The business consists of two segments
based on the nature of services it offers: Logistics and Storage ("L&S") and
Gathering and Processing ("G&P"). The L&S segment primarily engages in the
gathering, transportation, storage and distribution of crude oil, refined
products, other hydrocarbon-based products, and renewables. The L&S segment also
includes the operation of our refining logistics, fuels distribution and inland
marine businesses, terminals, rail facilities and storage caverns. The G&P
segment provides gathering, processing and transportation of natural gas as well
as the transportation, fractionation, storage and marketing of NGLs.

                                       23
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Significant Financial and Other Highlights

Significant financial highlights for the three months ended March 31, 2023 and
March 31, 2022 are shown in the chart below. Refer to the Results of Operations,
the Liquidity and Capital Resources, and Non-GAAP Financial Information sections
for further information.
                            [[Image Removed: 9341]]

(1) Non-GAAP measure. See reconciliations that follow for the most directly comparable GAAP measures.



Other Highlights

•Generated $1,227 million of net cash provided by operating activities, $1,268
million of distributable cash flow attributable to MPLX, and $1,005 million of
adjusted free cash flow in the first quarter of 2023.
•Returned $821 million of capital to unitholders in the three months ended
March 31, 2023, in the form of distributions.
•Announced a first quarter 2023 distribution of $0.7750 per common unit.
•Issued $1.6 billion of senior notes and used the proceeds to redeem all of the
$0.6 billion outstanding Series B preferred units and $1.0 billion of senior
notes due July 2023.

Current Economic Environment

In 2023, data indicates a slowed increase in inflation in the U.S. and globally.
We cannot predict the effect of rising interest rates, the concern of a
recession, and inflation and fuel prices on demand for our products and
services. In response to this business environment, MPLX remains focused on
executing its strategic priorities of strict capital discipline, fostering a
low-cost culture, and portfolio optimization. To the extent permitted by
competition, regulation and our existing agreements, many of which provide for
inflation-based adjustments, we have passed along a portion of our increased
costs to our customers in the form of higher fees and expect to continue to do
so in the future.

Non-GAAP Financial Information



Our management uses a variety of financial and operating metrics to analyze our
performance. These metrics are significant factors in assessing our operating
results and profitability and include the non-GAAP financial measures of
Adjusted EBITDA, DCF, adjusted free cash flow ("Adjusted FCF"), and Adjusted FCF
after distributions. The amount of Adjusted EBITDA and DCF generated is
considered by the board of directors of our general partner in approving MPLX's
cash distributions.

We define Adjusted EBITDA as net income adjusted for: (i) provision for income
taxes; (ii) interest and other financial costs; (iii) depreciation and
amortization; (iv) income/(loss) from equity method investments; (v)
distributions and adjustments related to equity method investments; (vi) gain on
sales-type leases; (vii) impairment expense; (viii) noncontrolling interests;
and (ix) other adjustments, as applicable. We also use DCF, which we define as
Adjusted EBITDA adjusted for: (i) deferred revenue impacts; (ii) sales-type
lease payments, net of income; (iii) net interest and other financial costs;
(iv) net maintenance capital expenditures; (v) equity method investment capital
expenditures paid out; and (vi) other adjustments as deemed necessary.

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We define Adjusted FCF as net cash provided by operating activities adjusted
for: (i) net cash used in investing activities; (ii) cash contributions from
MPC; and (iii) cash distributions to noncontrolling interests. We define
Adjusted FCF after distributions as Adjusted FCF less base distributions to
common and preferred unitholders.

We believe that the presentation of Adjusted EBITDA, DCF, Adjusted FCF and
Adjusted FCF after distributions provides useful information to investors in
assessing our financial condition and results of operations. The GAAP measures
most directly comparable to Adjusted EBITDA and DCF are net income and net cash
provided by operating activities while the GAAP measure most directly comparable
to Adjusted FCF and Adjusted FCF after distributions is net cash provided by
operating activities. These non-GAAP financial measures should not be considered
alternatives to GAAP net income or net cash provided by operating activities as
they have important limitations as analytical tools because they exclude some
but not all items that affect net income and net cash provided by operating
activities or any other measure of financial performance or liquidity presented
in accordance with GAAP. These non-GAAP financial measures should not be
considered in isolation or as substitutes for analysis of our results as
reported under GAAP. Additionally, because non-GAAP financial measures may be
defined differently by other companies in our industry, our definitions may not
be comparable to similarly titled measures of other companies, thereby
diminishing their utility. For a reconciliation of Adjusted EBITDA and DCF to
their most directly comparable measures calculated and presented in accordance
with GAAP, see Results of Operations. For a reconciliation of Adjusted FCF and
Adjusted FCF after distributions to their most directly comparable measure
calculated and presented in accordance with GAAP, see Liquidity and Capital
Resources.

Comparability of our Financial Results



During the normal course of business, we amend or modify our contractual
agreements with customers. These amendments or modifications require the
agreements to be reassessed under ASU No. 2016-02, Leases ("ASC 842"), which can
impact the classification of revenues or costs associated with the agreement.
These reassessments may impact the comparability of our financial results.

Results of Operations



The following tables and discussion summarize our results of operations,
including a reconciliation of Adjusted EBITDA and DCF from Net income and Net
cash provided by operating activities, to the most directly comparable GAAP
financial measures. This discussion should be read in conjunction with Item 1.
Financial Statements and is intended to provide investors with a reasonable
basis for assessing our historical operations, but should not serve as the only
criteria for predicting our future performance.
                                                                             Three Months Ended March 31,
(In millions)                                                          2023               2022            Variance

Revenues and other income:



Total revenues and other income                                   $     2,713          $ 2,610          $     103
Costs and expenses:
Cost of revenues (excludes items below)                                   308              287                 21
Purchased product costs                                                   406              467                (61)
Rental cost of sales                                                       20               37                (17)
Rental cost of sales - related parties                                      7               15                 (8)
Purchases - related parties                                               361              319                 42
Depreciation and amortization                                             296              313                (17)
General and administrative expenses                                        89               78                 11
Other taxes                                                                30               34                 (4)
Total costs and expenses                                                1,517            1,550                (33)
Income from operations                                                  1,196            1,060                136
Related-party interest and other financial costs                            -                4                 (4)
Interest expense, net of amounts capitalized                              224              198                 26
Other financial costs                                                      19               20                 (1)
Income before income taxes                                                953              838                115
Provision for income taxes                                                  1                5                 (4)
Net income                                                                952              833                119
Less: Net income attributable to noncontrolling interests                   9                8                  1
Net income attributable to MPLX LP                                        943              825                118

Adjusted EBITDA attributable to MPLX LP(1)                              1,519            1,393                126
DCF attributable to MPLX(1)                                       $     1,268          $ 1,210          $      58

(1) Non-GAAP measure. See reconciliation below to the most directly comparable GAAP measures.


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                                                                                        Three Months Ended March 31,
(In millions)                                                                     2023               2022            Variance

Reconciliation of Adjusted EBITDA attributable to MPLX LP and DCF attributable to GP and LP unitholders from Net income: Net income

$       952          $   833          $     119
Provision for income taxes                                                             1                5                 (4)
Interest and other financial costs                                                   243              222                 21
Income from operations                                                             1,196            1,060                136
Depreciation and amortization                                                        296              313                (17)
Income from equity method investments                                               (134)             (99)               (35)
Distributions/adjustments related to equity method investments                       153              132                 21

Other(1)                                                                              18               (4)                22
Adjusted EBITDA                                                                    1,529            1,402                127
Adjusted EBITDA attributable to noncontrolling interests                             (10)              (9)                (1)
Adjusted EBITDA attributable to MPLX LP                                            1,519            1,393                126
Deferred revenue impacts                                                              12               24                (12)
Sales-type lease payments, net of income                                               4                5                 (1)
Net interest and other financial costs(2)                                           (217)            (204)               (13)
Maintenance capital expenditures, net of reimbursements                              (44)             (14)               (30)

Equity method investment maintenance capital expenditures paid out

           (5)              (3)                (2)
Other                                                                                 (1)               9                (10)
DCF attributable to MPLX LP                                                        1,268            1,210                 58
Preferred unit distributions                                                         (28)             (32)                 4
DCF attributable to GP and LP unitholders                                   

$ 1,240 $ 1,178 $ 62




(1)  Includes unrealized derivative gain/(loss), non-cash equity-based
compensation and other miscellaneous items.
(2)  Excludes gain/loss on extinguishment of debt and amortization of deferred
financing costs.

                                                                             Three Months Ended March 31,
(In millions)                                                          2023               2022            Variance

Reconciliation of Adjusted EBITDA attributable to MPLX LP and DCF attributable to GP and LP unitholders from Net cash provided by operating activities: Net cash provided by operating activities

$     1,227          $ 1,125          $     102
Changes in working capital items                                           48              118                (70)
All other, net                                                             (9)             (45)                36
Loss on extinguishment of debt                                              9                -                  9
Net interest and other financial costs(1)                                 217              204                 13

Other adjustments to equity method investment distributions                13               12                  1
Other                                                                      24              (12)                36
Adjusted EBITDA                                                         1,529            1,402                127
Adjusted EBITDA attributable to noncontrolling interests                  (10)              (9)                (1)

Adjusted EBITDA attributable to MPLX LP                                 1,519            1,393                126
Deferred revenue impacts                                                   12               24                (12)
Sales-type lease payments, net of income                                    4                5                 (1)
Net interest and other financial costs(1)                                (217)            (204)               (13)
Maintenance capital expenditures, net of reimbursements                   (44)             (14)               (30)

Equity method investment maintenance capital expenditures paid out

                                                                        (5)              (3)                (2)
Other                                                                      (1)               9                (10)
DCF attributable to MPLX LP                                             1,268            1,210                 58
Preferred unit distributions                                              (28)             (32)                 4
DCF attributable to GP and LP unitholders                         $     

1,240 $ 1,178 $ 62

(1) Excludes gain/loss on extinguishment of debt and amortization of deferred financing costs.


                                       26

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Table of Contents Three months ended March 31, 2023 compared to three months ended March 31, 2022



Total revenues and other income increased $103 million in the first quarter of
2023 compared to the same period of 2022. The increase was driven by higher
throughput and rate escalations across the business and a $35 million increase
in income from equity method investments. The increases were partially offset by
a decrease in product sales revenue as a result of lower NGL prices during the
first quarter of 2023 as compared to the same period of 2022.

Cost of revenues increased $21 million and rental cost of sales (including
related party) decreased $25 million in the first quarter of 2023 compared to
the same period of 2022. These offsetting variances reflect the modification of
a gathering and compression agreement in the third quarter of 2022 ("Third-Party
Lease Modification") which resulted in a change in the presentation of expenses
from rental cost of sales to cost of revenues.

Purchased product costs decreased $61 million in the first quarter of 2023
compared to the same period of 2022. This was primarily due to lower prices of
$157 million in the Southwest and Southern Appalachia, partially offset by
higher volumes in the Southwest of $82 million and increase of $6 million due to
changes in the fair value of our embedded derivative.

Purchases - related parties increased $42 million in the first quarter of 2023 compared to the same period of 2022. This was primarily due to higher related-party purchased product costs and higher transportation costs.



Depreciation and amortization decreased $17 million in the first quarter of 2023
compared to the same period of 2022. This was primarily due to lower
depreciation as a result of the derecognition of fixed assets in connection with
the Third-Party Lease Modification in the third quarter of 2022. This decrease
was partially offset by depreciation on new assets placed in service after the
first quarter of 2022.

Interest expense, net of amounts capitalized increased $26 million in the first
quarter of 2023 compared to the same period of 2022. This was primarily due to
refinancing debt with fixed rate debt at higher interest rates in 2022 and 2023.
These increases were partially offset by lower variable rate interest in 2023.
Refer to the Liquidity and Capital Resources section for further information.


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Segment Results

We classify our business in the following reportable segments: L&S and G&P. We
evaluate the performance of our segments using Segment Adjusted EBITDA. Segment
Adjusted EBITDA represents Adjusted EBITDA attributable to the reportable
segments. Amounts included in net income and excluded from Segment Adjusted
EBITDA include: (i) depreciation and amortization; (ii) interest and other
financial costs; (iii) income/(loss) from equity method investments; (iv)
distributions and adjustments related to equity method investments; (v) gain on
sales-type leases; (vi) impairment expense; (vii) noncontrolling interests; and
(viii) other adjustments, as applicable. These items are either: (i) believed to
be non-recurring in nature; (ii) not believed to be allocable or controlled by
the segment; or (iii) are not tied to the operational performance of the
segment.

The tables below present information about Segment Adjusted EBITDA for the reported segments for the three months ended March 31, 2023 and March 31, 2022.

L&S Segment

First Quarter L&S Segment Financial Highlights (in millions)


                   [[Image Removed: 77]][[Image Removed: 80]]
                                                                         Three Months Ended March 31,
(In millions)                                                     2023                2022             Variance
Service revenue                                              $      1,033          $    983          $      50
Rental income                                                         212               175                 37
Product related revenue                                                 5                 4                  1
Sales-type lease revenue                                              125               111                 14
Income from equity method investments                                  71                52                 19
Other income                                                           14                12                  2
Total segment revenues and other income                             1,460             1,337                123
Cost of revenues                                                      135               141                 (6)
Purchases - related parties                                           244               239                  5
Depreciation and amortization                                         129               130                 (1)
General and administrative expenses                                    49                43                  6

Other taxes                                                            19                21                 (2)
Total costs and expenses                                              576               574                  2

Segment Adjusted EBITDA                                             1,026               904                122
Capital expenditures                                                   68                77                 (9)
Investments in unconsolidated affiliates(1)                  $         15   

$ 68 $ (53)

(1) The three months ended March 31, 2022 includes a contribution of $60 million to our Bakken Pipeline joint venture to fund our share of a debt repayment by the joint venture.

Three months ended March 31, 2023 compared to three months ended March 31, 2022



Service revenue increased $50 million in the first quarter of 2023 compared to
the same period of 2022. This was primarily driven by increased pipeline and
terminal throughput, higher pipeline tariff rates and $5 million from refining
logistics fee escalations. These increases were partially offset by a decrease
of $31 million from changes in the presentation of revenue between service
revenue, rental income and sales-type lease revenue driven by modifications to
agreements with MPC.

Rental income increased $37 million in the first quarter of 2023 compared to the
same period of 2022. This was primarily due to an increase of $20 million from
changes in the presentation of revenue between service revenue, rental income
and sales-type
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lease revenue driven by modifications to agreements with MPC after the first
quarter of 2022. There was also increased revenue of $9 million from refining
logistics primarily due to fee escalations.

Sales-type lease revenue - related parties increased $14 million in the first
quarter of 2023 compared to the same period of 2022. This was primarily due to
an increase of $11 million from changes in the presentation of revenue between
service revenue, rental income and sales-type lease revenue as a result of
modifications to agreements with MPC, as well as from fee escalations.

Income from equity methods investments increased $19 million in the first quarter of 2023 compared to the same period of 2022. This was primarily driven by increased throughput on equity method investment pipeline systems.

Cost of revenues decreased $6 million due to environmental response and remediation costs incurred in the first quarter of 2022. This decrease was partially offset by pipeline imbalance losses and increased energy costs.



L&S Operating Data
                             [[Image Removed: 24]]

                                                Three Months Ended
                                                     March 31,
                                                 2023              2022
L&S
Pipeline throughput (mbpd)
Crude oil pipelines                            3,642              3,380
Product pipelines                              1,988              1,956
Total pipelines                                5,630              5,336

Average tariff rates ($ per barrel)(1)
Crude oil pipelines                       $     0.93             $ 0.93
Product pipelines                               0.85               0.82
Total pipelines                           $     0.90             $ 0.89

Terminal throughput (mbpd)                     3,091              2,941

Marine Assets (number in operation)(2)
Barges                                           298                296
Towboats                                          23                 23


(1)   Average tariff rates calculated using pipeline transportation revenues
divided by pipeline throughput barrels. Transportation revenues include tariff
and other fees, which may vary by region and nature of services provided.
(2)   Represents total at end of period.
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G&P Segment
          First Quarter G&P Segment Financial Highlights (in millions)
                  [[Image Removed: 77]] [[Image Removed: 80]]

                                                       Three Months Ended March 31,
(In millions)                                         2023                 2022       Variance
Service revenue                            $      525                    $  486      $     39
Rental income                                      51                        81           (30)
Product related revenue                           564                       661           (97)
Sales-type lease revenue                           34                         -            34
Income from equity method investments              63                        47            16
Other income/(loss)                                16                        (2)           18
Total segment revenues and other income         1,253                     1,273           (20)
Cost of revenues                                  200                       198             2
Purchased product costs                           406                       467           (61)
Purchases - related parties                       117                        80            37
Depreciation and amortization                     167                       183           (16)
General and administrative expenses                40                        35             5
Other taxes                                        11                        13            (2)
Total costs and expenses                          941                       976           (35)

Segment Adjusted EBITDA                           493                       489             4
Capital expenditures                              123                        95            28
Investments in unconsolidated affiliates   $       36                    $  

42 $ (6)

Three months ended March 31, 2023 compared to three months ended March 31, 2022



Service revenue increased $39 million in the first quarter of 2023 compared to
the same period of 2022. This was primarily due to higher throughput fee rates
in the Marcellus and Rockies, increased revenue from minimum volume commitments,
and higher volumes.

Rental income decreased $30 million and sales-type lease revenue increased $34
million in the first quarter of 2023 compared to the same period of 2022. This
was primarily due to changes in the presentation of revenue between rental
income and sales-type lease revenue as a result of the Third-Party Lease
Modification in the third quarter of 2022.

Product related revenue decreased $97 million in the first quarter of 2023 compared to the same period of 2022. This was primarily due to lower prices across all regions of $197 million, partially offset by higher volumes in the Southwest of $100 million.



Income from equity methods investments increased $16 million in the first
quarter of 2023 compared to the same period of 2022. This was primarily due to
higher volumes associated with several of our joint ventures in the Utica.
Additionally, new capacity came online in the Southwest region in the fourth
quarter of 2022 driving higher volumes over the prior period.

Other income increased $18 million in the first quarter of 2023 compared to the
same period of 2022 due to a loss on disposal of assets recognized in the first
quarter of 2022.

Purchased product costs decreased $61 million in the first quarter of 2023
compared to the same period of 2022. This was primarily due to lower prices of
$157 million in the Southwest and Southern Appalachia, partially offset by
higher volumes in the Southwest of $82 million, an increase of $6 million due to
changes in the fair value of our embedded derivative.

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Purchases - related parties increased $37 million in the first quarter of 2023
compared to the same period of 2022. The increase is attributable to higher
volumes and associated related-party purchased product costs in the Rockies and
higher transportation costs from increased throughput in the Southwest.

Depreciation and amortization decreased $16 million in the first quarter of 2023
compared to the same period of 2022. This was primarily due to lower
depreciation as a result of the derecognition of fixed assets in connection with
the Third-Party Lease Modification in the third quarter of 2022. This decrease
was partially offset by depreciation on new assets placed in service after the
first quarter of 2022.

G&P Operating Data


                 [[Image Removed: 23]]    [[Image Removed: 24]]

(1) Other includes Southern Appalachia, Bakken and Rockies Operations.



                                                                 MPLX LP(1)                                       MPLX LP Operated(2)
                                                             Three Months Ended                                   Three Months Ended
                                                                  March 31,                                            March 31,
                                                       2023                         2022                  2023                          2022
G&P
Gathering Throughput (MMcf/d)
Marcellus Operations                                   1,363                         1,314                1,363                            1,314
Utica Operations                                           -                             -                2,460                            1,813
Southwest Operations                                   1,381                         1,307                1,816                            1,476
Bakken Operations                                        156                           147                  156                              147
Rockies Operations                                       442                           394                  564                              526
Total gathering throughput                             3,342                         3,162                6,359                            5,276

Natural Gas Processed (MMcf/d)
Marcellus Operations                                   4,045                         4,015                5,553                            5,529
Utica Operations                                           -                             -                  494                              423
Southwest Operations                                   1,401                         1,384                1,720                            1,541
Southern Appalachian Operations                          230                           224                  230                              224
Bakken Operations                                        154                           143                  154                              143
Rockies Operations                                       454                           407                  454                              407
Total natural gas processed                            6,284                         6,173                8,605                            8,267

C2 + NGLs Fractionated (mbpd)
Marcellus Operations(3)                                  533                           468                  533                              468
Utica Operations(3)                                        -                             -                   28                               23
Southern Appalachian Operations                           10                            10                   10                               10
Bakken Operations                                         19                            21                   19                               21
Rockies Operations                                         3                             4                    3                                4
Total C2 + NGLs fractionated(4)                          565                           503                  593                              526



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                                             Three Months Ended
                                                  March 31,
                                              2023              2022
Pricing Information
Natural Gas NYMEX HH ($ per MMBtu)     $     2.77             $ 4.57
C2 + NGL Pricing ($ per gallon)(5)     $     0.77             $ 1.15


(1)   This column represents operating data for entities that have been
consolidated into the MPLX financial statements.
(2)   This column represents operating data for entities that have been
consolidated into the MPLX financial statements as well as operating data for
MPLX-operated equity method investments.
(3)   Entities within the Marcellus and Utica Operations jointly own the
Hopedale fractionation complex. Hopedale throughput is included in the Marcellus
and Utica Operations and represent each region's utilization of the complex.
(4)   Purity ethane makes up approximately 246 mbpd and 184 mbpd of MPLX LP
consolidated total fractionated products for the three months ended March 31,
2023 and March 31, 2022, respectively. Purity ethane makes up approximately 253
mbpd and 188 mbpd of MPLX Operated total fractionated products for the three
months ended March 31, 2023 and March 31, 2022, respectively.
(5)  C2 + NGL pricing based on Mont Belvieu prices assuming an NGL barrel of
approximately 35 percent ethane, 35 percent propane, six percent Iso-Butane, 12
percent normal butane and 12 percent natural gasoline.

Seasonality



The volume of crude oil and refined products transported and stored utilizing
our assets is affected by the level of supply and demand for crude oil and
refined products in the markets served directly or indirectly by our assets. The
majority of effects of seasonality on the L&S segment's revenues will be
mitigated through the use of our fee-based transportation and storage services
agreements with MPC that include minimum volume commitments.

In our G&P segment, we experience minimal impacts from seasonal fluctuations
which impact the demand for natural gas and NGLs and the related commodity
prices caused by various factors including variations in weather patterns from
year to year. We are able to manage the seasonality impacts through the
execution of our marketing strategy. Overall, our exposure to the seasonality
fluctuations is limited due to the nature of our fee-based business.

Liquidity and Capital Resources

Cash Flows

Our cash and cash equivalents were $393 million at March 31, 2023 and $238 million at December 31, 2022. The change in cash and cash equivalents was due to the factors discussed below. Net cash provided by (used in) operating activities, investing activities and financing activities were as follows:



                                        Three Months Ended
                                             March 31,
(In millions)                            2023             2022
Net cash provided by (used in):
Operating activities              $     1,227           $ 1,125
Investing activities                     (220)             (276)
Financing activities                     (852)             (820)
Total                             $       155           $    29



Net cash provided by operating activities increased $102 million in the first
quarter of 2023 compared to the first quarter of 2022, primarily due to improved
results from operations and decreased working capital requirements in the first
quarter of 2023 compared to the first quarter of 2022.

Net cash used in investing activities decreased $56 million in the first quarter
of 2023 compared to the first quarter of 2022, due to lower contributions to
equity method investments. Contributions to equity method investments for the
2022 quarter included a $60 million contribution to our Bakken Pipeline joint
venture to fund our share of a scheduled debt repayment by the joint venture.

Net cash used in financing activities increased $32 million in the first quarter
of 2023 compared to the first quarter of 2022. The increase in the use of cash
was due to $63 million of higher distributions paid to unitholders during the
first quarter of 2023 as compared to the same period of 2022, as a result of the
10 percent increase in our base distribution effective for the third quarter of
2022. Net repayments, including the redemption of the Series B preferred units,
in the first quarter of 2023 as compared to net borrowings in the first quarter
of 2022 resulted in an increased use of cash of $68 million. These increases
were offset by decreased spending on the unit repurchase program of $100 million
in the first quarter of 2023 compared to the first quarter of 2022.

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Adjusted Free Cash Flow

The following table provides a reconciliation of Adjusted FCF and Adjusted FCF
after distributions from net cash provided by operating activities for the three
months ended March 31, 2023 and March 31, 2022.

                                                                       Three Months Ended
                                                                            March 31,
(In millions)                                                             2023                    2022
Net cash provided by operating activities(1)                         $      1,227             $    1,125

Adjustments to reconcile net cash provided by operating activities to adjusted free cash flow Net cash used in investing activities

                                        (220)                  (276)
Contributions from MPC                                                          8                     10

Distributions to noncontrolling interests                                     (10)                    (9)
Adjusted free cash flow                                                     1,005                    850

Distributions paid to common and preferred unitholders                       (821)                  (758)
Adjusted free cash flow after distributions                          $        184             $       92

(1) The three months ended March 31, 2023 and March 31, 2022 include working capital builds of $48 million and $118 million, respectively.

Debt and Liquidity Overview



On February 9, 2023, MPLX issued $1.6 billion aggregate principal amount of
notes, consisting of $1.1 billion principal amount of 5.00 percent senior notes
due 2033 (the "2033 Senior Notes") and $500 million principal amount of 5.65
percent senior notes due 2053 (the "2053 Senior Notes"). The 2033 Senior Notes
were offered at a price to the public of 99.170 percent of par with interest
payable semi-annually in arrears, commencing on September 1, 2023. The 2053
Senior Notes were offered at a price to the public of 99.536 percent of par with
interest payable semi-annually in arrears, commencing on September 1, 2023.

On February 15, 2023, MPLX used $600 million of the net proceeds to redeem all
of the outstanding Series B preferred units. On March 13, 2023, MPLX used the
remaining proceeds from the issuance of the 2033 Senior Notes and 2053 Senior
Notes discussed above, and cash on hand, to redeem all of MPLX's and MarkWest's
$1.0 billion aggregate principal amount of 4.50 percent senior notes due July
2023, at par, plus accrued and unpaid interest. The redemption resulted in a
loss of $9 million due to the immediate expense recognition of unamortized debt
discount and issuance costs for the three months ended March 31, 2023, which is
included on the Consolidated Statements of Income as Other financial costs.

Our intention is to maintain an investment-grade credit profile. As of March 31, 2023, the credit ratings on our senior unsecured debt were as follows:



Rating Agency          Rating
Moody's                Baa2 (stable outlook)
Standard & Poor's      BBB (stable outlook)
Fitch                  BBB (stable outlook)



The ratings reflect the respective views of the rating agencies. Although it is
our intention to maintain a credit profile that supports an investment grade
rating, there is no assurance that these ratings will continue for any given
period of time. The ratings may be revised or withdrawn entirely by the rating
agencies if, in their respective judgments, circumstances so warrant.

The agreements governing our debt obligations do not contain credit rating
triggers that would result in the acceleration of interest, principal or other
payments solely in the event that our credit ratings are downgraded. However,
any downgrades in the credit ratings of our senior unsecured debt ratings to
below investment grade ratings could, among other things, increase the
applicable interest rates and other fees payable under the MPLX Credit Agreement
and may limit our ability to obtain future financing, including refinancing
existing indebtedness.

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Our liquidity totaled $3.9 billion at March 31, 2023 consisting of:

                                                   March 31, 2023
                                                                              Available
(In millions)                Total Capacity      Outstanding Borrowings        Capacity
MPLX Credit Agreement(1)    $        2,000      $                     -      $    2,000

MPC Loan Agreement                   1,500                            -           1,500
Total                       $        3,500      $                     -           3,500
Cash and cash equivalents                                                           393
Total liquidity                                                              $    3,893

(1) Outstanding borrowings include less than $1 million in letters of credit outstanding under this facility.



We expect our ongoing sources of liquidity to include cash generated from
operations and borrowings under our revolving credit facilities and access to
capital markets. We believe that cash generated from these sources will be
sufficient to meet our short-term and long-term funding requirements, including
working capital requirements, capital expenditure requirements, contractual
obligations, and quarterly cash distributions. Our material future obligations
include interest on debt, payments of debt principal, purchase obligations
including contracts to acquire plant, property and equipment, and our operating
leases and service agreements. We may also, from time to time, repurchase our
senior notes or preferred units in the open market, in tender offers, in
privately negotiated transactions or otherwise in such volumes, at market prices
and upon such other terms as we deem appropriate and execute unit repurchases
under our unit repurchase program. MPC manages our cash and cash equivalents on
our behalf directly with third-party institutions as part of the treasury
services that it provides to us under our omnibus agreement. From time to time,
we may also consider utilizing other sources of liquidity, including the
formation of joint ventures or sales of non-strategic assets.

The MPLX Credit Agreement contains certain representations and warranties,
affirmative and restrictive covenants and events of default that we consider to
be usual and customary for an agreement of this type. The financial covenant
requires MPLX to maintain a ratio of Consolidated Total Debt as of the end of
each fiscal quarter to Consolidated EBITDA (both as defined in the MPLX Credit
Agreement) for the prior four fiscal quarters of no greater than 5.0 to 1.0 (or
5.5 to 1.0 during the six-month period following certain acquisitions).
Consolidated EBITDA is subject to adjustments for certain acquisitions completed
and capital projects undertaken during the relevant period. Other covenants
restrict us and/or certain of our subsidiaries from incurring debt, creating
liens on assets and entering into transactions with affiliates. As of March 31,
2023, we were in compliance with this financial covenant with a ratio of
Consolidated Total Debt to Consolidated EBITDA of 3.52 to 1.0, as well as all
other covenants contained in the MPLX Credit Agreement.

Equity and Preferred Units Overview

Unit Repurchase Program




On August 2, 2022 we announced the board authorization for the repurchase of up
to an additional $1.0 billion of MPLX common units held by the public. The
authorization has no expiration date. We may utilize various methods to effect
the repurchases, which could include open market repurchases, negotiated block
transactions, accelerated unit repurchases, tender offers or open market
solicitations for units, some of which may be effected through Rule 10b5-1
plans. The timing and amount of future repurchases, if any, will depend upon
several factors, including market and business conditions, and such repurchases
may be discontinued at any time.

No units were repurchased during the three months ended March 31, 2023. As of March 31, 2023, we had $846 million remaining under the repurchase authorization.

Redemption of the Series B Preferred Units



On February 15, 2023, MPLX exercised its right to redeem all 600,000 outstanding
units of 6.875 percent Fixed-to-Floating Rate Cumulative Redeemable Perpetual
Preferred Units (the "Series B preferred units"). MPLX paid unitholders the
Series B preferred unit redemption price of $1,000 per unit. See Note 5 to the
unaudited consolidated financial statements for more information.

Distributions on the Series B preferred units were payable semi-annually in
arrears on the 15th day, or the first business day thereafter, of February and
August of each year up to and including February 15, 2023. In accordance with
these terms, MPLX made a final cash distribution of $21 million to Series B
preferred unitholders on February 15, 2023, in conjunction with the redemption.

Distributions



We intend to pay a minimum quarterly distribution to the holders of our common
units of $0.2625 per unit, or $1.05 per unit on an annualized basis, to the
extent we have sufficient cash from our operations after the establishment of
cash reserves and the payment of costs and expenses, including reimbursements of
expenses to our general partner. The amount of distributions paid
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under our policy and the decision to make any distributions is determined by our
general partner, taking into consideration the terms of our partnership
agreement. Such minimum distribution would equate to $263 million per quarter,
or $1,051 million per year, based on the number of common units outstanding at
March 31, 2023.

On April 25, 2023, MPLX declared a cash distribution for the first quarter of
2023, totaling $776 million, or $0.775 per common unit. This distribution will
be paid on May 15, 2023 to common unitholders of record on May 5, 2023. Although
our partnership agreement requires that we distribute all of our available cash
each quarter, we do not otherwise have a legal obligation to distribute any
particular amount per common unit. This rate will also be received by Series A
preferred unitholders.

The allocation of total cash distributions is as follows for the three months
ended March 31, 2023 and March 31, 2022. MPLX's distributions are declared
subsequent to quarter end; therefore, the following table represents total cash
distributions applicable to the period in which the distributions were earned.
                                                                           Three Months Ended
                                                                                March 31,
(In millions, except per unit data)                                      2023                  2022
Distribution declared:
Limited partner units - public                                    $       274              $      257
Limited partner units - MPC                                               502                     456

Total LP distribution declared                                            776                     713
Series A preferred units                                                   23                      21
Series B preferred units                                                    5                      11
Total distribution declared                                       $       804              $      745

Quarterly cash distributions declared per limited partner common
unit                                                              $     0.775              $    0.705



Capital Expenditures

Our operations are capital intensive, requiring investments to expand, upgrade,
enhance or maintain existing operations and to meet environmental and
operational regulations. Our capital requirements consist of growth capital
expenditures and maintenance capital expenditures. Growth capital expenditures
are those incurred for acquisitions or capital improvements that we expect will
increase our operating capacity for volumes gathered, processed, transported or
fractionated, decrease operating expenses within our facilities or increase
operating income over the long term. Examples of growth capital expenditures
include costs to develop or acquire additional pipeline, terminal, processing or
storage capacity. In general, growth capital includes costs that are expected to
generate additional or new cash flow for MPLX. In contrast, maintenance capital
expenditures are those made to replace partially or fully depreciated assets, to
maintain the existing operating capacity of our assets and to extend their
useful lives, or other capital expenditures that are incurred in maintaining
existing system volumes and related cash flows.

MPLX's initial capital investment plan for 2023 is $950 million, net of
reimbursements, which includes growth capital of $800 million and maintenance
capital of $150 million. Growth capital expenditures and investments in
affiliates during the three months ended March 31, 2023 were primarily for gas
processing plants and gathering projects in the Marcellus and Permian basins. We
continuously evaluate our capital plan and make changes as conditions warrant.

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Our capital expenditures are shown in the table below:

                                                          Three Months Ended
                                                               March 31,
(In millions)                                               2023              2022
Capital expenditures:
Growth capital expenditures                         $      139               $ 148
Growth capital reimbursements(1)                           (33)             

(11)


Investments in unconsolidated affiliates                    51              

110



Capitalized interest                                        (3)             

(2)


Total growth capital expenditures                          154              

245


Maintenance capital expenditures                            52              

24


Maintenance capital reimbursements                          (8)             

(10)



Total maintenance capital expenditures                      44              

14



Total growth and maintenance capital expenditures          198              

259


Investments in unconsolidated affiliates(2)                (51)             

(110)



Growth and maintenance capital reimbursements(3)            41              

21


Increase in capital accruals                               (22)             

(3)


Capitalized interest                                         3              

2


Additions to property, plant and equipment(2)       $      169

$ 169




(1)  Growth capital reimbursements include reimbursements from customers and our
Sponsor. Prior periods have been updated to reflect these reimbursements to
conform to the current period presentation.
(2)  Investments in unconsolidated affiliates and additions to property, plant
and equipment are shown as separate lines within investing activities in the
Consolidated Statements of Cash Flows.
(3)  Growth capital reimbursements are included in changes in deferred revenue
within operating activities in the Consolidated Statements of Cash Flows.
Maintenance capital reimbursements are included in the Contributions from MPC
line within financing activities in the Consolidated Statements of Cash Flows.

Contractual Cash Obligations



As of March 31, 2023, our contractual cash obligations included debt, finance
and operating lease obligations, purchase obligations for services and to
acquire property, plant and equipment, and other liabilities. During the three
months ended March 31, 2023, our debt obligations increased by $600 million due
to the issuance of Senior Notes and use of proceeds described above in Liquidity
and Capital Resources-Debt and Liquidity Overview. There were no other material
changes to our contractual obligations outside the ordinary course of business
since December 31, 2022.

Off-Balance Sheet Arrangements



Off-balance sheet arrangements comprise those arrangements that may potentially
impact our liquidity, capital resources and results of operations, even though
such arrangements are not recorded as liabilities under GAAP. Our off-balance
sheet arrangements are limited to guarantees that are described in Note 14 of
the unaudited consolidated financial statements and indemnities as disclosed in
our Annual Report on Form 10-K for the year ended December 31, 2022.

Although these arrangements serve a variety of our business purposes, we are not
dependent on them to maintain our liquidity and capital resources, and we are
not aware of any circumstances that are reasonably likely to cause the
off-balance sheet arrangements to have a material adverse effect on our
liquidity and capital resources.

Transactions with Related Parties

At March 31, 2023, MPC owned our non-economic general partnership interest and held approximately 65 percent of our outstanding common units.



We provide MPC with crude oil, product pipeline, and trucking transportation
services based on regulated tariff/contracted rates, as well as storage,
terminal, fuels distribution, and inland marine transportation services based on
contracted rates. We also have agreements with MPC under which we receive fees
for operating MPC's retained pipeline assets, providing management services for
the marine business, and operating certain of MPC's equity method investments.
MPC provides us with certain services related to information technology,
engineering, legal, accounting, treasury, human resources and other
administrative services under employee services and omnibus services agreements.

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The below table shows the percentage of Total revenues and other income as well
as Total costs and expenses with MPC:

                                         Three Months Ended
                                              March 31,
                                            2023             2022
Total revenues and other income                    50  %     48  %
Total costs and expenses                           27  %     24  %



For further discussion of agreements and activity with MPC and related parties
see Item 1. Business in our Annual Report on Form 10-K for the year ended
December 31, 2022 and Note 4 to the unaudited consolidated financial statements
in this report.

Environmental Matters and Compliance Costs



We have incurred and may continue to incur substantial capital, operating and
maintenance, and remediation expenditures as a result of environmental laws and
regulations. If these expenditures, as with all costs, are not ultimately
reflected in the prices of our products and services, our operating results will
be adversely affected. We believe that substantially all of our competitors must
comply with similar environmental laws and regulations. However, the specific
impact on each competitor may vary depending on a number of factors, including,
but not limited to, the age and location of its operating facilities.

As previously disclosed in our Annual Report on Form 10-K for the year ended
December 31, 2022, actual expenditures may vary as the number and scope of
environmental projects are revised as a result of improved technology or changes
in regulatory requirements. There have been no significant changes to our
environmental matters and compliance costs during the three months ended
March 31, 2023.

Critical Accounting Estimates



As of March 31, 2023, there have been no significant changes to our critical
accounting estimates since our Annual Report on Form 10-K for the year ended
December 31, 2022.

Accounting Standards Not Yet Adopted



We have not identified any recent accounting pronouncements that are expected to
have a material impact on our financial condition, results of operations or cash
flows upon adoption. Accounting standards are discussed in Note 2 of the
unaudited consolidated financial statements.

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