I was just going by the energy inputs not producing the machinery which I assume would wash out in the long term. Ie just run the tractors, trucks, fertilizer factory and distillation plant on ethanol. If ethanol is a s great a claimed, then it could directly substitute for fossil fuel in all of these capacities.
It is NOT efficient to put everything on one farm. That is why the farmer finds it more efficient to sell his corn to somebody else to turn into food rather than processing and canning it on his farm.