Helping to improve fuel economy and performance.
TOP TIER® gasoline – quality you can depend on
When you fill up at an Exxon- or Mobil-branded station, you can be confident you’re getting TOP TIER gasoline, every time. Available in three octane levels, our unleaded gasoline has been developed to clean up vital engine parts like intake valves and fuel injectors, which helps improve fuel economy and performance.*
Exxon and Mobil gasoline grades
Gasoline grades are based on octane ratings. The octane rating of gasoline tells you how much the fuel can be compressed before it spontaneously ignites. In most areas of the country our regular gasoline is 87 octane, midgrade is 89 and premium is 91 to 93. To determine which unleaded gasoline is best for your vehicle, check your owner’s manual
Exxon and Mobil Regular Gasoline
Our regular grade unleaded gasoline was developed to meet the needs of most vehicles in America and is our most popular gasoline.
Exxon Plus and Mobil Special Gasoline
Our midgrade unleaded gasoline was developed to meet the needs of vehicles that can benefit from a higher octane, such as some sport vehicles and high performance cars.
Exxon Supreme and Mobil Super+ Gasoline
Our premium grade unleaded gasoline was formulated with a higher octane level and additional detergent additives to meet the demands of some of today’s most advanced engines. It generally has an octane level of 93 but is blended with an octane level of 91 or 92 in certain areas of the U.S.
FAQs about gasoline
Discover what steps we take to ensure the quality of our fuels.
Get the most out of your engine, and your journey, with Exxon and Mobil gasoline and diesel.
Explore our comprehensive list of tips to help you improve fuel efficiency and get more out of every trip.
This video goes inside an engine to show you how Exxon and Mobil gasoline works.