Heavy duty truck on open road. Go on. Work with our best diesel. Cleaner engine. Better mileage.* Exxon Mobil Synergy Diesel Efficient logo

Synergy Diesel Efficient™ fuel for fleets, light-duty trucks and passenger vehicles

Synergy Diesel Efficient fuel is fully formulated to help keep commercial vehicle engines cleaner for 2% better diesel fuel economy,** which means less maintenance and downtime. It also helps improve mileage and deliver more power in light-duty trucks and passenger vehicles.
  • Fuel economy icon

    Increase fuel economy by an average of 2%*

  • Engine icon

    Boost engine power and responsiveness

  • Decreasing Emission icon

    Reduce emissions and burn cleaner

  • Badge icon

    Improve injector cleanliness and provide corrosion protection

See how we developed Synergy Diesel Efficient fuel — and what its advanced formulation can mean for your business.

In cold climates, winterized Synergy Diesel Efficient fuel helped reduce occurrences of fuel gelling — which can cause fuel starvation, loss of engine power and stalling.

five exxon mobil fuel credit card programs

Keep business on the road

Broad commercial fleet card acceptance

Manage your mixed-fleet and heavy-duty business and fuel expenses with even broader acceptance of EFS, Fleet One and T-Chek fleet cards at Exxon™ and Mobil™ high-speed diesel and retail pumps.

Find a station
fleet card inserted into a diesel fuel pump

Here, there and everywhere

Go further with your fleet card

Manage your fleet’s fuel expenses with FleetPro™ or BusinessPro™ credit cards. Both offer nationwide location acceptance, spending controls and reporting, flexible terms, loyalty benefits for you and your employees, and 24/7 customer service.

Learn more about FleetPro™ and BusinessPro™ credit cards
  • Find and buy premium gas near me with the app

    Download the Exxon Mobil Rewards+™* app

    It’s the convenient, fast and secure way to pay for gas, earn points and get rewarded through the Exxon Mobil Rewards+™ program. Start saving with every fill-up of gasoline.

    Details about the Exxon Mobil Rewards+ app
  • Mobil Diesel commercial canopy and commercial vehicles

    Quality fuel, discounted pricing and rewards for drivers

    No matter the size of your fleet, we have a fleet program that can help you control costs and improve fuel economy.

    Learn more
  • fuelman card is now welcome everywhere

    Fuelman® is welcome everywhere

    Now you can fill up with Synergy Diesel Efficient™ using your Fuelman® credit card at all 12,000+ locations, with 800+ Exxon and Mobil high-speed diesel pumps across the country.

    See where Fuelman is accepted
  • mobil delvac diesel engine oils

    Diesel engine oils

    Mobil Delvac™ diesel engine oils are the choice of leading heavy-duty equipment manufacturers as well as drivers and fleets around the globe when it comes to keeping engines protected on the road.

    Learn more about Mobil Delvac diesel engine oil

*Applies to Exxon and Mobil Synergy Diesel Efficient branded fuel compared to diesel fuel without detergent additive, and assumes a 250 gallon tank and an average of 7 miles per gallon. Vehicle testing showed an average fuel economy improvement of 2 percent. Actual benefits will vary depending on factors such as vehicle/engine type, driving style and diesel fuel 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.

§§Benefits are 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.

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