parados wrote: Where did you get your 200,000 figure? It takes no ethanol to produce ethanol. You can do it completely with diesel fuel and coal.
You do realize that a barrel of ethanol is not equivalent to a barrel of oil. You only get about 21 gallons of gasoline from a barrel of oil. You get 42 gallons of ethanol from a barrel of ethanol.
Depending on which study you accept, ethanol shows a net gain or a net loss in energy. Several studies show a net gain, and I've picked the following site that seems to argue your point of view:
http://www.ethanol.org/documents/NetEnergyBalanceissuebrief_000.pdf
From this document, if I am interpreting the figures correctly, it takes roughly 60% of the amount of energy contained in the ethanol produced to produce the ethanol. Granted, the energy used to make ethanol may come from other forms of energy, such as coal, natural gas, etc, but bottom line if you translate it all into an equation of ethanol, if you produce about 300,000 barrels of ethanol, it would take roughly an equivalent of 60% or that quantity, or roughly 180,000 barrels of ethanol, leaving a net gain of only 120,000 barrels of ethanol production per day.
It would be interesting to know what the net gain of energy is involved with producing useable forms of energy, such as gasoline, from oil pumped out of the ground, but I am guessing it is far better than the ratio involved with ethanol. And in the case of natural gas, it seems the ratio would be exceptionally attractive. Coal may not be quite as attractive because of the mining and transportation required to bring the coal to the point of producing energy, but I am guessing it is still far better than ethanol. I did a quick search on the web, but was unable to find the data for oil, natural gas, or coal, but I am sure the information is probably available somewhere.