E85 vehicles can burn a blended fuel that contains 85% ethanol and 15% gasoline. Ethanol is a grain alcohol made from renewable resources, commonly corn. Flex-fuel vehicle engines can be run on regular unleaded gasoline or any fuel that is blended with ethanol as long as the ethanol content does not exceed 85%. Millions of vehicles on the road today are flex-fuel compatible. Ethanol has less energy (BTUs) per volume than gasoline, resulting in lower fuel economy. E85 Fuel (85% ethanol/15% gasoline) contains about 81,800 BTUs per gallon (3.785 L), whereas gasoline has about 114,100 BTUs per gallon (3.785 L). Another disadvantage of using E85 is the limited number of refueling stations.