There is nothing new in the use of alcohol as a motor fuel. In 1872, when Nikolaus Otto invented the internal combustion engine, gasoline was not available. Ethyl alcohol at 180-190 proof was the specified fuel. * * * [A]lcohols have a relatively high anti-knock or octane rating [and] have the ability to raise considerably the octane ratings of gasolines with which they are mixed. . . . The ability to increase octane rating means that: (1) a lower (therefore cheaper) grade of gasoline can be used to obtain a fuel with a certain octane rating; and (2) the use...