We don’t eat field corn that’s made into ethanol. It’s mostly used for animal feed, soda pop, and corn starch.
It all bumps over (and I’m sure you know that). Farmers that have a choice as to which crop move towards corn (any type) if there’s a greater demand there. It all (essentially) coming from the same amount of land...although, eventually, market forces should bring the supply up (assuming that we don’t go to 15% ethanol first).