Ethanol is for drinking, not for running motor vehicles.

You can actually make ethanol from anything in the plant kingdom. The only question is how much sugar it has available in it. Maple sap. Maize stalks and leaves. Sugar cane. Tomatoes. Potato peelings. Walnut hulls. Cactus. Grapes. Dandelions. Rotten cabbages. Grass.

Ethanol is produced the same way for cars as it is for people: mash, still beer, low wines, doublings, triplings. You can run it through a worm three times or use a thump keg.

You'll just lay there by the junipers
When the moon is bright
Watch them barrels fillin'
In the pale moonlight....