I had not heard that ethanol was used anywhere but in “automotive” gasoline mixtures.
That is the problem, the “push” is on from enviro nutz through the EPA to finally get aviation into the green age, and require no lead in av gas and additives such as ethanol to green up the industry. So far nothing has been certified to replace 100LL for aviation fuel, but “friends of the Earth” are watching and impatiently waiting. It’s for the children.