Regan Brown
Flex-fuel vehicles can run on any octane level of gasoline. They can also use regular gasoline and E85, a blend of gasoline and ethanol. E85 is a gasoline-ethanol blend containing between 51% to 85% ethanol, depending on the season and region. E85 is corrosive and can damage a traditional gasoline engine, so it should only be used in vehicles that are specifically marked as FlexFuel compatible.
| Characteristics | Values |
|---|---|
| Can a flex-fuel car run on 87 octane? | Yes, using any octane level of gasoline in a flex-fuel vehicle is acceptable. |
| Flex-fuel vehicles | Can use regular gasoline. |
| E85 | A gasoline-ethanol blend containing between 51% to 85% ethanol, depending on the season and region. |
| E85 vs 87 octane | E85 will have significantly more alcohol per gallon and less thermal energy than 87 octane. |
| Fuel economy | E85 has worse fuel economy than 87 octane. |
| E85 in non-flex fuel vehicles | Using E85 in a car not designed for flexible fuel can be harmful. |
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What You'll Learn
- E85 is a gasoline-ethanol blend that contains 51% to 85% ethanol
- E85 can be used in flex-fuel vehicles, but not traditional gasoline engine cars
- Regular gasoline can be used in a flex-fuel vehicle
- E85 may cause issues with cold crank start-ups in cold weather
- E85 is a renewable and domestically produced alternative fuel
E85 is a gasoline-ethanol blend that contains 51% to 85% ethanol
Flex-fuel vehicles can run on any octane level of gasoline. They can also use E85, a blend of gasoline and ethanol containing between 51% and 85% ethanol, depending on the season and region. E85 is a type of flexible fuel, a term for a renewable and domestically produced alternative to gasoline. It is a higher ethanol blend than the typical E10 (10% ethanol) found in most US gas.
E85 is only suitable for flex-fuel vehicles, and using it in a traditional gasoline engine can cause damage. Flex-fuel vehicles have sensors that detect the gasoline-ethanol ratio in the fuel and adjust for optimal performance. This is why they can run on any octane level of gasoline.
Some owners of flex-fuel vehicles opt to use E85 as it is often cheaper than regular 87 octane gasoline. However, E85 has a worse fuel economy than regular gasoline, and this negates any cost savings. It can also cause issues with cold crank start-ups in cold weather.
It is important to refer to the owner's manual for specifications on the fuel to use in a vehicle. While flex-fuel vehicles can run on any octane level of gasoline, some manufacturers of higher-end vehicles recommend only using mid-range and premium gas.
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E85 can be used in flex-fuel vehicles, but not traditional gasoline engine cars
E85 is a type of flex fuel, a blend of gasoline and ethanol. It contains between 51% and 85% ethanol, with the remainder being gasoline. This is a higher percentage of ethanol than the more common E10 and E15 blends. E85 is marked at gas pumps and can be used in flex-fuel vehicles (FFVs).
Flex-fuel vehicles are designed to run on any octane level of gasoline, including regular gasoline, and are also compatible with E85. The sensors in an FFV detect whether the fuel is pure gasoline or 85% ethanol and adjust the fuel injection and timing of combustion accordingly.
However, E85 should not be used in cars that are not specifically designed for flexible fuel. Putting E85 in a car not designed for it can be harmful. Traditional gasoline engine cars are not compatible with E85 and will be damaged if it is used.
While E85 can be used in flex-fuel vehicles, it is important to note that it may result in worse fuel economy compared to E10. E85 has a much higher octane rating but yields less energy than gasoline, resulting in lower thermal energy per gallon.
For flex-fuel vehicles, it is recommended to refer to the owner's manual for specifications on the fuel to use.
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Regular gasoline can be used in a flex-fuel vehicle
Flex-fuel vehicles can run on regular gasoline. These vehicles are designed to run on a blend of gasoline and ethanol, also known as flexible fuel. The sensors in a flex-fuel vehicle (FFV) detect whether the fuel is pure gasoline or a blend of gasoline and ethanol, such as E85, which contains up to 85% ethanol. The vehicle then makes the necessary adjustments for optimal fuel injection and combustion timing.
While E85 is a popular choice for FFVs due to its higher ethanol content, it is not always readily available. In such cases, it is perfectly acceptable to use regular gasoline in a flex-fuel vehicle. Regular gasoline typically contains a lower percentage of ethanol, such as E10 (10% ethanol) or E15 (15% ethanol). Using regular gasoline in an FFV will not cause any harm to the vehicle, and it will continue to run optimally thanks to the vehicle's sensors and adjustment capabilities.
For example, owners of Ford flex-fuel vehicles have confirmed that they can use regular gasoline in their cars. One owner of a Ford Explorer, a flex-fuel vehicle, mentions that they can use regular gasoline up to premium and E85 without any issues. Similarly, another owner of a 2015 Ram 1500 3.6L Flex Fuel experimented with using E85 and regular 91 octane gasoline. They observed that while E85 provided better mileage, it was more expensive and resulted in slightly lower fuel economy.
It is worth noting that some flex-fuel vehicles may have specific recommendations or requirements regarding the type of gasoline to use. For instance, some higher-end vehicles might recommend using mid-range or premium gasoline. Therefore, it is always advisable to refer to the owner's manual for specific information about the fuel requirements of your flex-fuel vehicle. Additionally, while regular gasoline can be safely used in an FFV, it is essential to ensure that the vehicle is designed for flexible fuel. Using E85 or other ethanol blends in a non-flex-fuel vehicle can be harmful.
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E85 may cause issues with cold crank start-ups in cold weather
E85 fuel, which contains a high percentage of ethanol, can cause issues with cold crank startups in cold weather. This is a known issue, and there are some methods to help mitigate the problem. Firstly, it is important to note that the amount of ethanol in the fuel can affect cold crank startups. Using fuel with a lower ethanol content can help improve startups in cold weather. This may mean using regular gasoline, which has a lower ethanol content than E85.
Another solution is to adjust the fuel injector settings. Increasing the injector pulse width during the crank can help. However, this adjustment depends on the temperature, and the exact amount of adjustment required is still under debate. Some experimentation may be needed to find the right settings for your vehicle. Additionally, it is important to be cautious when making these adjustments, as too much fuel can be detrimental.
Other methods to address cold crank startup issues include using block warmers, starter fluid, and feathering the gas while cranking. However, these methods may not be as effective as making adjustments to the fuel injector settings.
It is worth noting that some vehicles seem to be more affected by this issue than others. For example, users have reported issues with Honda and Acura vehicles, while others have mentioned Ford and Ram trucks. It is always recommended to refer to the owner's manual for vehicle-specific information and guidance.
In summary, while E85 fuel may cause issues with cold crank startups in cold weather, there are methods to address this problem. Adjusting fuel injector settings and using fuel with lower ethanol content can help improve startups. Additionally, it is important to be cautious when making adjustments, as too much fuel can cause issues.
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E85 is a renewable and domestically produced alternative fuel
Flex-fuel vehicles can run on regular gasoline or E85, a domestically produced, renewable, alternative fuel blend consisting of around 85% ethanol and 15% gasoline. E85 is also known as Flex Fuel and is made for use in specially prepped flex-fuel vehicles. It has a higher octane rating than gasoline, but yields less energy. It is usually cheaper per gallon than regular unleaded, but this can vary depending on availability.
E85 burns cleaner than straight gasoline, reducing a vehicle's greenhouse gas emissions. It is also pretty resistant to spark knock. However, it is less efficient than gasoline and reduces a vehicle's fuel economy.
Flex-fuel vehicles can use regular gasoline, with owners reporting that they use 88 octane fuel or 91 octane gasoline in their vehicles. Some owners also report that they use E85 in the summer and regular gasoline in the winter, as E85 can cause issues with cold crank start-ups in cold weather.
As of March 2025, there were more than 4,200 public gas stations in 44 US states that sell E85, with most pumps located in the Midwest. Flex fuel has been available to varying degrees since the 1990s, and there are currently 11 MY2024 and MY2025 flex-fuel vehicles sold in North America, including models from GM and Ford.
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Frequently asked questions
Yes, a flex-fuel car can run on 87 octane. A flex-fuel car can use any octane level of gasoline.
A flex-fuel car is a vehicle that can run on a blend of gasoline and ethanol.
E85 is a blend of gasoline and ethanol that contains between 51% to 85% ethanol, depending on the season and region.
E85 should only be used in vehicles that are specifically marked as FlexFuel compatible. Using E85 in a car not designed for flexible fuel can be harmful.
Flex-fuel is a renewable and domestically produced alternative fuel. It is also compatible with regular gasoline, so you can use either fuel depending on availability and price.
