In the simplest form, an alternative fuel is one that is not produced by using crude oil. They are simply fuels that replace conventional gasoline as a means of powering vehicles.
Alternative fuels have desirable energy efficiency and pollution reduction features. The 1990 Clean Air Act
encourages development and sale of alternative fuels. More specifically, the Energy Policy Act (EP Act) of 1993 gave a more in-depth definition of what they consider to be alternative fuels. The United States Department of Energy recognizes the following as alternative fuels.
