Rajan Wilcox
Flex-fuel vehicles (FFVs) can run on gasoline, ethanol, or a combination of the two in the same tank. They are compatible with regular gasoline and can also use E85, a blend of 85% ethanol. FFVs have sensors that detect the ratio of gasoline to ethanol and adjust for optimal performance. To determine if your car is an FFV, you can check for badging that says flex fuel or for a yellow gas cap. You can also refer to your owner's manual or check for a decal under the fuel door indicating E85 use is allowed.
Characteristics and Values of Flex Fuel Vehicles
| Characteristics | Values |
|---|---|
| Fuel Type | Gasoline, Ethanol (blends up to E85), or a combination of the fuels |
| Vehicle Type | FFV (Flex-Fuel Vehicle) |
| FFV Models | Buick, Chevrolet, Ford, GMC, Chrysler, Volkswagen, Hyundai, Mazda, Jaguar Land Rover, Nissan |
| Identification | "Flex Fuel" badging on the rear, yellow fuel cap, "Flex-Fuel Vehicle" or "E85" on the inside of the fuel door, owner's manual indication |
| Engine Features | Sensors that detect the gasoline-ethanol ratio and make adjustments for optimal performance |
| Benefits | Burns cleaner, reduces reliance on foreign oil, eligible for tax incentives, lower cost per gallon |
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What You'll Learn
Check the rear of your car for a flex fuel badge
One of the easiest ways to determine if your car is a flex-fuel vehicle (FFV) is to check the rear of your car for a flex-fuel badge. These badges are usually placed on the rear ends of cars, trucks, and SUVs, and they will typically say "FlexFuel" or "FlexFuel E85 Ethanol". Almost 20 million vehicles in the United States are designed to be FFVs, but not all of them have this badge, so it is worth checking other indicators if you cannot find one.
The presence of a yellow fuel cap is another good indicator that your car is an FFV. This feature was introduced in 2008 models (2006 for General Motors), so if your car is older than this, it may be an FFV without the yellow fuel cap. You can also check the inside of the fuel door, as FFVs will often have the words "flex-fuel vehicle" or "E85" here.
If you are still unsure, you can refer to your owner's manual, which will indicate which fuels are approved for your vehicle. You can also check the Vehicle Emissions Control Information label, found under the hood. For Chrysler models, the flexible fuel vehicles are designated with the last letter of the 12-character Test Group Name posted on this label. Look for "Group: XXXXXXX.XXXX" and then check if the last letter corresponds to the designated letter groups for flexible fuel vehicles.
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Check the gas cap for a yellow colour
One of the easiest ways to determine if your car is a flex-fuel vehicle (FFV) is to check the gas cap. FFVs can run on gasoline, ethanol, or a combination of the two in the same tank. If your car is a 2008 or newer model, the gas cap will likely be yellow and have a badge indicating that it is an FFV. The badge may say "flex fuel vehicle" or "E85". In addition to checking the gas cap, you can also refer to your owner's manual or look for a sticker or decal on the fuel door or under the hood. This decal may be on the Vehicle Emissions Control Information label, which is located under the hood.
It is important to determine if your car is an FFV before filling up with E85 fuel. Putting E85 in a car that is not designed for flexible fuel can be harmful. FFVs have sensors that detect the gasoline-ethanol ratio in the fuel and make adjustments for optimal performance. Flex fuel offers several benefits, including lower greenhouse gas emissions, reduced reliance on foreign oil, and cost savings, as E85 typically costs less per gallon than regular gasoline.
If you own a Chrysler, you can also determine if your vehicle is E85 compatible by checking the last letter of the 12-character Test Group Name posted on the Vehicle Emissions Control Information label. The Test Group Name is located on the right of the label, just below the engine size. Look for "Group: XXXXXXX.XXXX" and then check if the last letter falls within the letter groups listed to the right.
In addition to Chrysler, several other automotive brands offer FFVs. For example, Buick, Chevrolet, Ford, and GMC offer FFVs in the 2025 model year. Volkswagen, Hyundai, Mazda, Jaguar Land Rover, and Nissan also offer models with the FFV system. However, it's important to note that flex-fuel compatibility may depend on specific trim levels or engine selections.
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Check the inside of the fuel door for flex-fuel vehicle or E85
One of the easiest ways to determine whether your car is a flex-fuel vehicle is to check the inside of the fuel door for a label that says "flex-fuel vehicle" or "E85". This label indicates that the vehicle is designed to handle E85 fuel, which is a blend of gasoline and ethanol that is typically 51% to 83% ethanol.
Flex-fuel vehicles (FFVs) are capable of running on either gasoline or alcohol-based fuels like E85. They offer several advantages, such as burning cleaner fuel, reducing America's dependence on foreign oil, and potentially making the driver eligible for tax incentives. However, it is important to ensure that your vehicle is indeed designed to handle E85 fuel before filling up with it, as using the wrong type of fuel can cause issues.
In addition to checking the fuel door, you can also refer to your owner's manual to determine if your vehicle is E85 compatible. Information about approved fuels for your vehicle can usually be found in the manual. For some vehicles, there may also be a decal or sticker under the hood, near the Vehicle Emissions Control Information label, that indicates E85 compatibility.
It is worth noting that not all flex-fuel vehicles have obvious indicators like badges or labels. However, starting with the 2008 model year, some vehicles began featuring yellow fuel caps as a sign of their flex-fuel capabilities. This feature may be helpful to look out for in combination with checking the fuel door and owner's manual.
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Check your owner's manual
One of the most reliable ways to find out if your car is flex-fuel is to check your owner's manual. Buried deep inside the owner's manual, there should be a notice about which fuels are approved for your vehicle. This will tell you whether your car is a flex-fuel vehicle (FFV) or not.
The owner's manual will also provide specifications on the fuel to use in your vehicle. It is important to refer to this information because using flex-fuel in a car that is not designed for it can be harmful. Flex-fuel vehicles have sensors that detect the gasoline-ethanol ratio in the fuel and make adjustments for optimal performance. However, putting E85 in a car not designed for flexible fuel can cause damage.
In addition to checking the owner's manual, you can also look for other signs that your car may be a flex-fuel vehicle. One indication is the colour of the gas cap. A yellow gas cap is a good indication that your car can use flex fuel. If your vehicle has a capless fuel filler, a yellow ring around the hole where the nozzle is inserted signals that E85 works for the vehicle.
Another place to look is the fuel door, where there may be a sticker or decal indicating what type of fuel the car can use. You can also check the emissions decal under the hood, which should be marked with information about fuel compatibility. Finally, you can refer to the vehicle identification number, as FFV models have a specific character in this number indicating E85 compatibility.
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Check the emissions decal under the hood
One way to determine if your car is flex-fuel is to check the emissions decal under the hood. This decal is usually located on the Vehicle Emissions Control Information label, which can be found under the hood of your car. It will typically be placed on the right side of the label, just below the engine size.
The decal will include a "Test Group Name," which is a 12-character code. To determine if your vehicle is E85 compatible, look for the last letter of this code. Chrysler, for example, designates flexible fuel vehicles with the last letter of the Test Group Name. So, if the last letter falls within the designated letter groups, your Chrysler is E85 compatible.
For Ford models, the process is slightly different. The FFV models are identified using the 8th character in the vehicle identification number, and there should also be a decal under the fuel door indicating that E85 use is allowed. This decal will typically feature the words "Flex Fuel" or "E85."
It's important to note that not all flex-fuel vehicles have obvious badges or decals declaring their flex-fuel capability. However, checking the emissions decal under the hood and cross-referencing it with your vehicle's identification number can be a reliable way to determine its fuel compatibility.
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Frequently asked questions
There are a few ways to identify if your car is a flex-fuel vehicle (FFV). Firstly, check the rear of your car for badging that says "flex fuel". Additionally, check the fuel cap and the inside of the fuel door for the words "flex-fuel vehicle" or "E85". You can also refer to your owner's manual, which will indicate if your car can run on flex fuel.
Several automotive brands offer FFVs, including Buick, Chevrolet, Ford, GMC, Chrysler, Volkswagen, Hyundai, Mazda, Jaguar Land Rover, and Nissan.
Flex-fuel vehicles can run on gasoline, ethanol (blends up to E85), or a combination of the two fuels in the same tank. It's important to note that flex-fuel, such as E85, should only be used in designated flex-fuel vehicles and not in traditional gasoline engines.
