Here is an amazing bit of data on where the US corn crop goes:
The Department of Agriculture says the corn crop in the US will be down 13% due to the drought. But corn available for food uses is down 40% due to the ethanol mandate. You do the math. Wait, I don't trust your math. I will do it for you:
PS- It's kind of amazing the supposed worst drought ever has dropped corn yields by just 13%. Hurray for modern agriculture. This year we will still produce about the same amount of corn we did in 2006.