How to Find Out if Your Car Is a Flex Fuel Car

1). Inspect your car's exterior. Walk around the vehicle; look for badges or decals that indicate it is a flex-fuel car. For example, some Ford vehicles have a sticker that displays "FFV" for flex-fuel vehicle. Some General Motors' vehicles have a sticker that's labeled "E85" for ethanol 85-percent blend.
2). Open your fuel-filler door and look at your gas cap and the inside part of the fuel-filler door. Flex-fuel vehicles often have stickers or markings indicating that the vehicle is safe for use with flex fuel.
3). Check your engine VIN (Vehicle Identification Number) code. The engine code is the eighth digit of your VIN number. See the flex-fuel resource below to determine if your vehicle is compatible with flex-fuel (the code is different for each make and model). If the digits match, your vehicle is safe to use with flex fuel. If it does not, do not use flex fuel with your car.