As a matter of fact, some of the earliest cars ever made were designed to run on ethanol instead of gasoline. Some service stations may sell compressed natural gas for vehicles. This is the same clean-burning fuel that we use to cook food or heat our homes. It can also be stored in cylinders on board cars and trucks to power their engines. Many delivery trucks, like those used by the Post Office, will probably run on natural gas.
Propane is another gas that can be used as a transportation fuel.
Still other cars will be powered by electricity . In the future, we may drive cars powered by hydrogen . All these fuels are called alternative fuels because they are an alternative to gasoline and diesel. Cars and trucks that use them are called Alternative Fuel Vehicles or AFVs. Right now, there are only a small number of cars and trucks that are running on fuels other than gasoline and diesel.