Synergy Supreme+™ premium gasoline is our best fuel ever

Exxon Mobil Synergy Supreme+ keeps your engine 2X cleaner for better gas mileage.

With Synergy Supreme+ premium gasoline, you can keep your engine 2X cleaner for better gas mileage. That means it’s not just our best fuel ever – it could even be your engine’s favorite fuel ever.

Synergy Supreme+ premium gas generally has an octane level of 93, but may be blended and sold at an octane level of 91 or 92 in certain areas of the US. Higher-octane gasoline provides improved performance in vehicles designed to run on premium gasoline.

A better clean for better gas mileage.

Fuel injectors – like spray bottles – don’t work well when they’re clogged. Synergy Supreme+ premium gas contains detergent that helps remove deposits – for cleaner fuel injectors, better fuel economy and smoother engine operation.

  • Deposits accumulate on port fuel injection (PFI) intake valves and gasoline direct injection (GDI) fuel injectors
  • Our Synergy Supreme+ premium gas contains significantly more cleaning agents than federal standards require leading to outstanding cleanliness
  • It keeps your engine clean by reducing deposit buildup
  • It even cleans up your engine by removing existing deposits left behind by gasoline that meets minimum government standards††

Reduce friction and protect against engine wear

Whether it’s your dancing shoes or engine parts, friction means wear and tear. We added a friction modifier to Synergy Supreme+ premium gas to prevent friction and provide you with our best engine protection ever.

  • Our friction modifier reduces wear and tear by 30%‡‡
  • It prevents metal surfaces from rubbing together, which can lead to improved performance and fuel economy
  • You get a gasoline that protects vital engine parts
Learn more about Synergy™ fuels


  • 2X points with ExxonMobil Rewards+ premium.

    Exxon Mobil Rewards+ Premium™ status§

    Get 2X points on Synergy Supreme+™ premium gasoline – plus special offers.

    Details and registration
  • bob oakman diesel fuel economy

    Synergy Diesel Efficient™ fuel

    It’s fully formulated to help keep diesel engines cleaner for better fuel economy.** Take it from Bob Oakman, legendary monster truck announcer. Available only at Exxon™ and Mobil™ stations.

    Learn more
  • EMR start earning

    Exxon Mobil Rewards+™ app

    It’s the convenient, fast and secure way to pay for fuel, earn points and get rewarded.

    See app details
  • Earn 25 cents per gallon at the pump

    The ExxonMobil™ Smart Card

    Earn on every gallon, every day

    Earn 25c off every gallon of Synergy™ gasoline for the first two months after account open date, then save 6c off every gallon when you apply and are approved for the ExxonMobil Smart Card by 10/31/20

    Apply online

Based on comparison of Synergy Supreme+ gas compared to Synergy regular gas in port fuel injected engines. Actual benefits are based on continuous use and may vary depending on vehicle type, driving style, and gasoline previously used. Concentration and availability of our proprietary additive package may vary based on factors beyond our control.

††Based on comparison of Synergy Supreme+ premium gas to gasoline that meets minimum government standards. Actual benefits are based on continuous use and may vary depending on vehicle type, driving style, and gasoline previously used. Concentration and availability of our proprietary additive package may vary based upon factors beyond our control.

‡‡Based on Synergy Supreme+ gas compared to gasoline meeting minimum government standards. Wear reduction was measured by an industry standard lubricant test. Actual benefits are based on continuous use and may vary depending on vehicle type, driving style, and gasoline previously used. Concentration and availability of our proprietary additive package may vary based on factors beyond our control.

§Exxon Mobil Rewards+ Premium Status (“Premium Status”) is achieved by making three (3) “Qualifying Purchases” in a calendar month. A Qualifying Purchase is defined as a purchase of 8 gallons or more of Synergy Supreme+ fuel with the Exxon Mobil Rewards+ program. You must present and use your Exxon Mobil Rewards+ card loyalty identifier prior to making a Qualifying Purchase at participating locations. Exxon Mobil Rewards+ Premium Status Benefits (“Benefits”) begin after Premium Status is earned. You must complete three Qualifying Purchases each calendar month to maintain your Benefits. In the event that Premium Status is not maintained in the following month, you have a grace period of three consecutive months starting from the end of the month in which Premium Status was last earned before your Premium Status benefits expire. Benefits include earning double base points (for a total of 6 points per gallon) on all Synergy Supreme+ purchases after earning and while maintaining Premium Status. You will also be eligible for various Premium Status offers and experiences that are available to Exxon Mobil Rewards+ Premium Status members. To view full Exxon Mobil Rewards+ terms, please click here. Your Premium Status is non-transferrable and does not preclude you from using other Exxon Mobil Rewards+ offers, unless specified. The Exxon Mobil Rewards+ Program Terms and Conditions apply.

§§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.

**Claims apply to Exxon and Mobil Synergy Diesel Efficient-branded fuel compared to diesel fuel without detergent additive. Actual benefits will vary depending on factors such as vehicle/engine type, driving style and diesel fuel previously used.

New accounts only. Subject to credit approval. Rebates will be reflected as a statement credit on your billing statement with qualifying purchases. Account must be open and in good standing to qualify. Terms and Conditions of the ExxonMobil Smart Card Rebate Program apply.

Download of the Exxon Mobil Rewards+™ app is required. Terms and Conditions of the ExxonMobil Smart Card Rebate Program apply.

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