MPLX LP to Announce 2012 Fourth-Quarter Financial Results Jan. 30

FINDLAY, Ohio, Jan. 9, 2013 - MPLX LP (NYSE: MPLX), a master limited partnership recently formed by Marathon Petroleum Corporation (NYSE: MPC), announced today that it will host a conference call on Wednesday, Jan. 30, at 2 p.m. EST to provide an update on company operations and to discuss 2012 fourth-quarter financial results, which will be released earlier that day.

MPLX participants will be Gary Heminger, chairman of the board and chief executive officer; Garry Peiffer, president; and Don Templin, vice president and chief financial officer. The call will be hosted by Pam Beall, vice president, Investor Relations.

Interested parties may listen to the conference call on MPLX's website at http://www.mplx.com by clicking on the "2012 Fourth Quarter Financial Results" link in the "News & Headlines" section. Replays of the conference call will be available on the company's website through Thursday, Feb. 14.

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About MPLX LP

MPLX is a fee-based, growth-oriented master limited partnership recently formed by Marathon Petroleum Corporation to own, operate, develop and acquire pipelines and other midstream assets related to the transportation and storage of crude oil, refined product and other hydrocarbon-based products. Headquartered in Findlay, Ohio, MPLX's assets consist of a 51 percent interest in a network of common carrier crude oil and products pipeline assets located in the Midwest and Gulf Coast regions of the United States and a 100 percent interest in a butane storage cavern located in West Virginia. Additional information about MPLX LP may be found on its website at www.mplx.com.

Investor Relations Contacts:
Pamela Beall (419) 429-5640
Beth Hunter (419) 421-2559

Media Contacts:
Angelia Graves (419) 421-2703


MPLX Earnings Call Jan. 30

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