Investor Presentaiton

Commodity Price Assumptions and Long-Term Outlook M MARATHON Commodity / Spread ($/BBL, unless noted) WTI Brent-WTI Brent-ANS Brent-ASCI LLS-WTI WTI-Bakken WTI-WCS ULSD-3% Fuel Oil Henry Hub ($/MMbtu) NGL Weighted Average ($/gal)³ 2018 Average¹ 2019 Business Plan² Long-Term Outlook² $65.00 $64 $50-$80 $6.75 $3.60 $3-$12 $(0.25) $0.10 $(1) - $2 $5.00 $6.50 $3-$9 $5.00 $3.25 $4 - $9 $2.50 $1.50 $1 - $11 $26.25 $22 $20-$40 $24.00 $34 $30 - $40 $3.25 $2.95 $2.50 - $4.50 $0.78 $0.76 $0.60 - $0.95 1 Full year 2018, rounded to nearest $0.25/BBL 2 MPC estimates as of December 4, 2018 3 Not rounded - Weighted 35% ethane, 35% propane, 12% normal butane, 6% isobutane and 12% C5+ 54 54

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