Investor Presentaiton

1 Canadian Crude Flexibility Broader system increases access to Canadian crudes enhancing margin capture ■ Over 500 MBPD of Canadian crude purchases Approximately 67% heavy and 33% light-synthetic Trans Mountain Anacortes Rail Portland Martinez Enbridge Mainline Clearbrook Keystone Cushing, OK Los Angeles 1 1 2014-'17 2018 Avg. Long-Term Outlook WTI-WCS 14.75 26.25 20-40 St. Paul, Park M MARATHON Detroit SAX/ Mustang Spearhead/Flan S. Ozark Seaway TransCanada Marketlink MPLX Barge Canton Robinson Catlettsburg Garyville Galveston Bay, Nederland, TX Note: Differentials ($/BBL) rounded to nearest $0.25; pipelines are shown pictorially only to show flow paths 1 Bloomberg 2 MPC estimates as of December 4, 2018 22 22

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