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

Exxon and Mobil Synergy™ gasoline  

Go premium for a 60% cleaner engine

Synergy Supreme+™ premium gasoline keeps your engine 60 percent cleaner for enhanced engine protection. Synergy Supreme+ 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.

Quality you can depend on

When you fill up at an Exxon™ or Mobil™ station, 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 to help clean up intake valves and improve gas mileage and performance.*
  • 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 prevent cold start problems at cold temperatures
  • Corrosion inhibitor – helps prevent rust in fuel distribution systems 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 and 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, flow and not freeze at very cold temperatures
  • Marker molecules – ensures we can determine if the correct amount of our unique additive is added to our gasoline

    Synergy 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 Synergy™ Regular Gasoline

      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 and Mobil Synergy™ Extra 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.

    • Gasoline Octane 91

      Exxon and Mobil Synergy SUPREME+™ 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.

    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.

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    • 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.

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    • 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

      Exxon and Mobil Synergy™ gasoline

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

      Learn more

    *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.

    Based on comparison of Synergy Supreme+™ premium gasoline to our regular gasoline. Actual benefits may vary depending on vehicle type, driving style and gasoline previously used.

    All trademarks used herein are trademarks or registered trademarks of Exxon Mobil Corporation or one of its subsidiaries unless indicated otherwise.


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