Unleaded and Premium Unleaded Gas - Synergy Fuel from Exxon and Mobil

Our gasoline  

Introducing Exxon and Mobil SynergyTM Gasoline

Engineered with 7 key ingredients, working together for better gas mileage.**

Meet the team:
Fuel Detergent 1 – helps provide excellent protection against intake valve deposits in traditional PFI (Port Fuel Injector) injection engines
Fuel Detergent 2 - helps provide Intake Valve Deposit protection for PFI engines and also provides additional protection for modern Direct Injection engines. Cleaner engine parts can lead to better gas mileage
Anti-Adhesion Compound - helps prevent fuel detergents from forming a sticky film on the intake valves; which in turn helps prevents cold start problems at cold temperatures
Corrosion Inhibitor - helps prevent rust in fuel distribution system and/or key engine parts the fuel comes into contact with such as the gas tank and the intake valves
Demulsifier - helps keep water from getting entrained in our additive in the distribution system. Helps prevent accumulation of water in your gas tank by allowing it to be separated and removed
Solvent Fluid - enables the additive ingredients to stay mixed and to flow, and not freeze at very cold temperatures
Marker Molecules - ensures we can determine the correct amount of our unique additive is added to our gasoline

Find out how each ingredient works.

Synergy™ gasoline – quality you can depend on

When you fill up at an Exxon- or Mobil- branded stations, you can be confident you’re getting TOP TIER gasoline, every time. Available in three octane levels, our Synergy™ gasoline has been engineered with 7 key ingredients and developed to clean up intake valves, which help improve gas mileage and performance.*

Exxon and Mobil SynergyTM gasoline grades

Gasoline grades are based on octane ratings. The higher the octane number the greater the fuel’s resistance to knocking or pinging during combustion. In most areas of the country our regular gasoline is 87 octane, midgrade is 89 and premium is 91 to 93. To determine which Synergy™ gasoline grade is best for your vehicle, check your owner’s manual.

Learn more about octane ratings >


  • Gasoline Octane 87

    Exxon and Mobil Regular Synergy™ Gasoline

    Octane 87

    Our regular grade unleaded gasoline was developed to meet the needs of most vehicles in America and is our most popular gasoline.

  • Gasoline Octane 89

    Exxon Plus and Mobil Special Synergy™ Gasoline

    Octane 89

    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.

  • Gasoline Octane 91

    Exxon Supreme and Mobil Super+ Synergy™ Gasoline

    Octane 91–93

    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.

Have a question about gasoline?

  • developing quality gas that’s best for your car

    Quality fuels to get you where you're going

    Discover what steps we take to ensure the quality of our fuels.

    Learn more
  • Our fuel types, gasoline, diesel and octane ratings

    The right fuel for your vehicle

    Get the most out of your engine, and your journey, with Exxon and Mobil SynergyTM gasoline and diesel.

    Learn more
  • Tips to help you improve fuel efficiency

    Get more out of every trip

    Explore our comprehensive list of tips to help you improve fuel efficiency and get more out of every trip.

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  • New Synergy gasoline

    Introducing Exxon and Mobil SynergyTM Gasoline

    Learn more about our new SynergyTM gasoline, engineered with 7 key ingredients to help you get better gas mileage.**

    Learn more
*Applies to Exxon- and Mobil-branded gasoline compared to gasoline meeting minimum U.S. government standards. Actual benefits vary depending on factors such as vehicle type, driving style and gasoline previously used.

**Fuel economy improvement is based on Synergy-branded gasoline compared to gasoline meeting minimum U.S. government standards. Actual benefits will vary based on factors such as vehicle type, driving style and gasoline previously used. Exxon, Mobil and Synergy are trademarks or registered trademarks of Exxon Mobil Corporation or one of its subsidiaries.
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