M
- Marathon Petroleum Company
- Marathon
- Pilot Travel Centers, LLC — United States
- Speedway SuperAmerica
- Starvin' Marvin's
- Martin and Bayley
- Huck's Now — Midwestern US
- Maverik Inc — Western US
- Maxol — Ireland
- Estuary
- McClure Oil Corporation - United States: Indiana McClure website
- MOL — Magyar Olaj és Gázipari Rt., Hungarian Oil in Hungary and Eastern Europe
- Meijer — Michigan, Ohio, Indiana, Illinois, Kentucky
- Murphy Oil Corporation
- MurphyUSA — United States, primarily at Wal-Mart locations
- MURCO — United Kingdom
Read more about this topic: List Of Automotive Fuel Brands