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MPLX LP : MPLX LP Declares Quarterly Distribution

              MPLX LP : MPLX LP Declares Quarterly Distribution

FINDLAY, Ohio, Jan. 25, 2013 - The board of directors of MPLX LP (MPLX)
declared a cash distribution of $0.1769 per common unit for the fourth quarter
of 2012. This amount corresponds to the prorated minimum quarterly
distribution of $0.2625 per unit, or $1.05 per unit on an annualized basis.
The distribution will be paid Feb. 14, 2013, to unitholders of record Feb. 4,
2013.

This release is intended to be a qualified notice under Treasury Regulation
Section 1.1446-4(b). Brokers and nominees should treat 100 percent of MPLX's
distributions to foreign investors as being attributable to income that is
effectively connected with a United States trade or business. Accordingly,
MPLX's distributions to non-United States investors are subject to federal
income tax withholding at the highest applicable effective tax rate.

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About MPLX LP

MPLX is a fee-based, growth-oriented 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

MPLX LP Quarterly Distribution

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This announcement is distributed by Thomson Reuters on behalf of Thomson
Reuters clients.

The owner of this announcement warrants that:
(i) the releases contained herein are protected by copyright and other
applicable laws; and
(ii) they are solely responsible for the content, accuracy and originality of
the
information contained therein.

Source: MPLX LP via Thomson Reuters ONE
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