Ethanol,also known as grain alcohol,is produced from starchy grains like corn or from sugarcane. It can be used by itself or added to gasoline. Ehanol cuts down on polluting emissions,but it produces less energy per liter than gasoline. however,the cost of the fuel is little as half the cost of gasoline in countries like Brazill,which is the world's biggest ethanol produce.In Brazil,the fuel can be found at every service station from downtown Rio de Janeiro to the remote Amazon region.