Fun fact: corn farmers almost always rotate with soybeans to replenish the nitrogen in the soil.

Also, most corn (and soybeans) is for animal food anyway. Very little of the corn grown in the US is for human consumption.

My understanding(not a corn farmer but have watched a show by one on youtube) is the farmer will harvest the corn then dry and store it, selling over the course of a year or two, the ethanol plant is sort of the fallback option when they need to get rid if it.

https://www.youtube.com/watch?v=CSB-8dn3CkI

Personally, I am in the rapeseed bandwagon. Ethanol is not a very good fuel, better to be growing bio-diesel