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The majority of corn beans and a lot of grain all go to feeding livestock. You could be a lot more efficient growing the food directly.
Corn isn’t very sweet (read energy rich). It’s ridiculous to farm it for fuel. There are crops that are good, but they don’t grow well in the continental US.
Feed/residual doesn’t that include running sheep on harvested fields to eat the stubble and turn it into fertiliser?
I don’t think so, since that wouldn’t be counted in the bushel yield.