Once again, ethanol is a poor choice. It contains less than have the energy of gasoline, by volume. Methanol would be a far better choice, even though it has only slightly more energy by volume than ethanol. But any sort of alcohol will be difficult to make work, for any number of reasons. At least methanol can be made from all sorts of byproducts and waste.
By the way, in order to get ALL of that half the amount of energy of gasoline per gallon, the engine needs to be specifically DESIGNED to run on alcohol. An alcohol fueled engine needs a lot more static compression, as well as a different camshaft. A gasoline engine operating on alcohol is doing so at greatly reduced efficiency.