Flexible Fuel Vehicles

Flexible fuel vehicles (FFVs) have an internal combustion engine and are capable of operating on gasoline, E85 (a gasoline-ethanol blend containing 51% to 83% ethanol, depending on geography and season), or a mixture of the two. According to Polk, there are more than 17.4 million FFVs on U.S. roads today. However, many flexible fuel vehicle owners don't realize their car is an FFV and that they have a choice of fuels.

Other than employing an ethanol-compatible fuel system and powertrain calibration, FFVs are similar to their conventional gasoline counterparts. The only perceivable difference is that the fuel economy is lower when FFVs run on blends above E10.

For fleets that have to comply with federal acquisition regulations, flexible fuel vehicles are considered alternative fuel vehicles (AFVs) under the Energy Policy Act of 1992.

How Flex Fuel Vehicles Work

FFVs have one fueling system, which is made up of ethanol-compatible components and a powertrain controller calibrated to accommodate the higher oxygen content of E85. View the illustration at the right to learn about the special features of an FFV.