
Synergy Diesel Efficient fuel is a type of diesel fuel developed by ExxonMobil. It is designed to improve fuel economy, boost engine performance, and provide cleaner emissions. The fuel is available at select Exxon and Mobil retail stations in the United States and can be used in both heavy-duty and light-duty vehicles. Some users have reported improved mileage and engine performance when using Synergy Diesel Efficient fuel, while others have questioned the validity of these claims. Independent laboratory and real-world testing have shown a 2% improvement in fuel economy when using Synergy Diesel Efficient fuel compared to unbranded diesel fuel without detergent additives.
| Characteristics | Values |
|---|---|
| Engine Performance | Better engine performance |
| Fuel Economy | 2% improvement on average |
| Maintenance | Reduced maintenance |
| Emissions | Cleaner emissions |
| Vehicle Type | Suitable for any vehicle fueled by diesel |
| Engine Cleanliness | Helps keep commercial vehicle engines cleaner |
| Fuel Gelling | Reduces occurrences of fuel gelling in cold climates |
| Fuel Availability | Available at Exxon and Mobil retail stations in the northern United States |
| Cetane Level | Higher cetane level than minimum ASTM D975 requirement |
| Detergency | Higher detergent levels than EPA requirements |
| Price | Priced below the competition |
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What You'll Learn
- Synergy Diesel Efficient fuel is formulated for use in any vehicle fueled by diesel
- It has been engineered to improve fuel economy, boost engine performance, and reduce maintenance
- It is advertised to have a different cetane rating
- It is cheaper than other diesel fuels
- It is certified TOP TIER® by the EPA

Synergy Diesel Efficient fuel is formulated for use in any vehicle fueled by diesel
Synergy Diesel Efficient fuel is a type of diesel fuel that is formulated for use in any vehicle fueled by diesel. It is designed to improve fuel economy, boost engine performance, and provide cleaner emissions. It is engineered with 7 key ingredients, including detergent additives, which help to protect the fuel delivery system and improve mileage.
Synergy Diesel Efficient fuel is available at Exxon and Mobil retail stations, with some users reporting higher mileage when using this fuel. It is also priced competitively, often at a discount compared to other diesel fuels. The fuel has been developed in the same laboratories as racing fuels, and its winterized version helps to prevent fuel gelling in cold climates.
Synergy Diesel Efficient fuel is suitable for a range of vehicles, including fleets, light-duty trucks, and passenger vehicles. It is also available at Costco stations, where it has been reported to deliver impressive mileage. The fuel has been advertised as having a different cetane rating, and some users have noted a difference in smell compared to regular diesel.
Synergy Diesel Efficient fuel is a TOP TIER®-certified gasoline, as it has passed a series of deposit control performance tests. It contains significantly higher detergent levels than EPA requirements, providing excellent protection against intake valve deposits. This helps to keep vehicle engines cleaner, reducing maintenance needs and downtime.
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It has been engineered to improve fuel economy, boost engine performance, and reduce maintenance
Synergy Diesel Efficient fuel is a product of Exxon and Mobil. It has been formulated for use in any vehicle fuelled by diesel, including light-duty trucks and passenger vehicles. It is also available in a winterized version, designed to reduce occurrences of fuel gelling in cold climates.
Synergy Diesel Efficient fuel has been engineered to improve fuel economy, boost engine performance, and reduce maintenance. Firstly, in terms of fuel economy, vehicle testing has shown an average improvement of 2%. This means users may experience higher mileage using Synergy Diesel Efficient fuel. Secondly, the product has been designed to boost engine performance by keeping commercial vehicle engines cleaner. This is achieved through the use of detergent additives, which help to clean and protect the fuel delivery system, including the carburetor or fuel injectors, and intake valves. The detergent additives in Synergy Diesel Efficient fuel are significantly higher than EPA requirements, and the product has passed a series of deposit control performance tests. Finally, regarding maintenance, the cleaner engines facilitated by Synergy Diesel Efficient fuel mean less maintenance and downtime.
Synergy Diesel Efficient fuel has been rigorously tested in the lab and on the road, and it is the first diesel fuel widely available in the US with a proprietary formulation. It was developed in the same laboratories as Exxon/Mobil racing fuels.
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It is advertised to have a different cetane rating
Synergy Diesel Efficient fuel is a product of Exxon and Mobil. It is advertised to have a higher cetane rating than the minimum ASTM D975 requirement. This is a positive attribute as cetane is a measure of a fuel's combustion quality, with higher ratings indicating easier compression ignition and less ignition delay.
Synergy Diesel Efficient fuel is formulated for use in any vehicle fueled by diesel, including fleets, light-duty trucks, and passenger vehicles. It is also available in a winterized version, designed to reduce occurrences of fuel gelling in cold climates.
The benefits of using Synergy Diesel Efficient fuel include improved fuel economy, boosted engine performance, reduced maintenance, and cleaner emissions. Specifically, vehicle testing has shown an average fuel economy improvement of 2%, although actual benefits may vary depending on factors such as vehicle/engine type, driving style, and previously used diesel fuel.
Synergy Diesel Efficient fuel is also engineered with higher detergent levels than EPA requirements. Detergency is the performance characteristic of a gasoline that refers to its ability to clean and protect the fuel delivery system, including the carburetor or fuel injectors, and intake valves. This results in a cleaner engine, which contributes to better fuel economy and performance.
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It is cheaper than other diesel fuels
Synergy Diesel Efficient fuel is a cost-effective option for vehicle owners, offering a range of benefits at a competitive price. This fuel type has been designed to improve fuel economy, enhance engine performance, and reduce maintenance requirements, all while being kinder to your wallet.
Synergy Diesel Efficient fuel is priced competitively, often at a discount compared to other diesel fuels. Users have reported prices well below the competition, with discounts of up to $0.20 to $0.30 per gallon. This makes it an attractive option for those seeking to save money on their fuel expenses without compromising on quality.
The fuel's formulation helps improve fuel economy by up to 2% on average, depending on factors such as vehicle type, engine specifications, and previous diesel fuel usage. This improvement in fuel efficiency contributes to the cost-effectiveness of Synergy Diesel Efficient fuel, as users can achieve more miles per gallon, reducing the overall fuel cost per mile.
In addition to its direct cost benefits, Synergy Diesel Efficient fuel also helps reduce maintenance expenses. Its unique formulation helps keep engines cleaner, minimizing the need for frequent maintenance and downtime. By reducing maintenance requirements, this fuel type further enhances its cost-effectiveness, making it a more economical choice in the long run.
Synergy Diesel Efficient fuel is suitable for a range of vehicles, including commercial fleets, light-duty trucks, and passenger cars. Its wide compatibility means that a diverse range of vehicle owners can take advantage of its cost-saving benefits. With its combination of performance enhancements and competitive pricing, Synergy Diesel Efficient fuel offers a compelling option for those seeking to optimize their fuel expenditure.
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It is certified TOP TIER® by the EPA
Synergy Diesel Efficient™ fuel is a product of Exxon and Mobil. It is formulated for use in any vehicle fuelled by diesel, including light-duty trucks and passenger vehicles. It has been engineered to improve fuel economy by 2% on average, boost engine performance, reduce maintenance, and provide cleaner emissions.
Synergy Diesel Efficient™ fuel is widely available in the US and is the first diesel fuel with a proprietary formulation that helps users get more out of every gallon. It is formulated with the latest breakthrough technology and rigorously tested in the lab and on the road.
Synergy Diesel Efficient™ fuel contains significantly higher detergent levels than EPA requirements and has passed a series of deposit control performance tests, resulting in it being certified TOP TIER®. The fuel detergents help provide excellent protection against intake valve deposits in traditional PFI (Port Fuel Injector) injection engines. They also provide additional protection for modern Direct Injection engines.
Winterized Synergy Diesel Efficient fuel is available from November through March at participating Exxon and Mobil retail stations in the northern United States. It is designed to reduce occurrences of fuel gelling in cold climates.
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Frequently asked questions
Synergy Diesel Efficient fuel is formulated for use in any vehicle fueled by diesel. It has been engineered to improve fuel economy by 2% on average, boost engine performance, reduce maintenance, and provide cleaner emissions.
The benefits of Synergy Diesel Efficient fuel include improved fuel economy, better engine performance, and reduced maintenance. It also helps keep commercial vehicle engines cleaner, which means less downtime. Additionally, it has higher detergent levels than EPA requirements, providing excellent protection against intake valve deposits.
No, Synergy Diesel Efficient fuel is formulated for use in any vehicle fueled by diesel, including light-duty trucks and passenger vehicles. It is also available in a winterized version designed to reduce fuel gelling in cold climates.











































