I happen to live in a farm state and when you start turning all those food crops into ethonal you have a big problem, and it has already started.
Well, I used to live in a "farm state", on a farm, and one that raised both corn and soybeans, and I can tell you that your so-called "big problem" doesn't exist.
The use of corn to make ethanol has NOTHING to do with the rise in food prices--the statistics on the increase in the amount of corn grown vs. the amount of corn used to make ethanol prove that pretty conclusively.
Enough extra corn has been grown to replace ALL that used in ethanol, plus a gigantic amount over that, and yet the price of corn-containing food has increased--which can ONLY be due to some other factor(s) than ethanol production.
The increase in price of OTHER grain products may indeed be due to substituting corn for the acreage normally devoted to those crops---I haven't seen any reasonable statistics one way or another.