Investor Presentaiton

TX Wink-to-Webster Pipeline (planned) Gray Oak Pipeline (under construction) 3 Permian Strategy Optimization Increasing integrated footprint in the Permian creates multiple benefits across our platform Gathering systems create direct crude sourcing of advantaged crude for our refineries (est. 300 MBPD total) Long haul pipelines lower transport cost and equity interest generates stable fee-based midstream income El Paso Wink Orla Freeport Ο Corpus Christi South Texas Gateway Terminal LA M MARATHON Garyville Galveston Bay 1 1 Export facilities provide flexibility 2014-'17 2018 Avg. Long-Term Outlook² 2 to optimize between MPC WTI-Midland 2.00 7.25 1-7 refining demand and global demand Brent-WTI 4.25 6.75 3-12 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 24 24

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