ethanol only makes sense if you are the farmer growing the grain and running your equipment on pure ethanol
<grow grain
<process grain to make 3 products
<corn oil
<high protein animal feed (the mash left from fermentation)
<ethanol… fuel for your equipment
grown corn, sell the great majority of it and process enough to make the fuel you need for farming
carbon neutral farming
all of the carbon released by the farm equipment was captured the previous year by the corn plants… no new carbon introduced into the atmosphere