I don’t know about that. But even the growing of corn uses a lot of oil.
I’d like to see the total amount of oil (or other carbon based fuel) used to get ethanol, including growing, harvesting, transportation, processing, etc)
Depending upon tillage practices for a given year, I'll use maybe 5 - 10 gallons of diesel per acre to grow a corn crop and deliver it either to an elevator or ethanol plant. That acre of corn will yield 500 - 600 gallons of ethanol, 3,000 - 3,500 pounds of protein feed and enough forage for a cow and calf to winter.