Business lines Global brands Select location Menu Search Exxon Home Synergy Diesel Efficient™ fuel Synergy Diesel Efficient™ fuel for fleets, light-duty trucks and passenger vehicles Believe the hype as only Bob Oakman can deliver it. 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. Increase fuel economy by an average of 2%* Boost engine power and responsiveness Reduce emissions and burn cleaner Improve injector cleanliness and provide corrosion protection A big-rig love story Synergy Diesel Efficient fuel has captured the heart of legendary monster truck announcer Bob Oakman. Watch the video to find out if he’s ready for marriage. Believe the hype Synergy Diesel Efficient fuel for light-duty trucks and passenger vehicles inspires legendary monster truck announcer Bob Oakman to amp up the oomph. Watch the video to find out how crazy he can get. 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. Quality fuel, discounted pricing and rewards for drivers Exxon™ and Mobil™ programs for fleets No matter the size of your fleet, we have a fleet program that can help you control costs and improve fuel economy. Learn more Your fleet’s new superpower Introducing FleetPro™ from Exxon and Mobil Designed for diesel and mixed-fuel fleets that require access to both commercial fueling locations and retail gas stations, FleetPro offers competitive nationwide discounts, Mastercard® acceptance and more. Optimize your fleet 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 fuel-up of top tier gasoline. See app details The right fuel for your vehicle Get the most out of your engine, and your journey, with Exxon and Mobil Synergy™ gasoline and diesel. Learn more 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. Learn more 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 *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. © 2021 ExxonMobil. All trademarks used herein are trademarks or registered trademarks of Exxon Mobil Corporation or one of its subsidiaries. All rights reserved. Energy lives here™ Contact us Select location Privacy center Do not sell my personal information Privacy policy Terms & conditions © 2021 ExxonMobil. All trademarks used herein are trademarks or registered trademarks of Exxon Mobil Corporation or one of its subsidiaries. All rights reserved.