MPLX LP : MPLX LP 2012 K-1 Tax Packages Now Available on Company Website

   MPLX LP : MPLX LP 2012 K-1 Tax Packages Now Available on Company Website

FINDLAY, Ohio, March 4, 2013 - MPLX LP (NYSE: MPLX) today announced that the
company's 2012 investor tax packages are now available on its website,
www.mplx.com. Investors may select the Tax Reporting Package link under the
Investor tab, or use the link provided:
www.mplx.com/Investors/Tax_Reporting_Package/.

Additionally, MPLX has begun mailing tax packages today, and will complete all
mailings by March 8, 2013. Questions regarding the Tax Reporting Package can
be addressed by contacting (855) 375-4157 (toll free) or via email at
MPLXK1Help@deloitte.com.

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About MPLX LP
MPLX is a fee-based, growth-oriented master limited partnership formed in 2012
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 products 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.

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

MPLX 2012 K-1

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Source: MPLX LP via Thomson Reuters ONE
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