Reply #7: Hmm. How about 925 gallons of water per gallon of ethanol?

[GliderGuider]

http://www.ecoworld.com/waters/corn-ethanol-water.html

According to these folks:

Corn is one of the better temperate crops to use as a primary biofuel feedstock, since cellulosic extraction isn’t here yet and sugar cane doesn’t grow in Iowa. Using corn as an example, a good ethanol yield is about 480 gallons per acre per year, which is based on 160 bushels per acre, and 3.0 gallons of ethanol per bushel. How much water corn needs varies greatly, and the range we’ve arrived at for this analysis is between 300 and 900 cubic meters per ton. Our source for 900 m3/ton is from a reference to UNESCO’s “The Water Footprint of Nations,” and our source for 300 m3/ton is from Colorado State University.

Since a bushel of corn weighs about 70 pounds, based on a yield of 160 bushels per acre, expressed in tons the per acre yield of corn is about 5.6 tons. This means, at the lower figure of 300 cubic meters of water per ton of corn, the average acre of corn requires 1,680 tons of water per harvest cycle, which equates to 444,000 gallons of water for every 480 gallon yield of ethanol. Clearly, from this perspective, the 3-6 additional gallons of water required after harvest to refine each gallon of corn ethanol is not the critical factor.

By just counting the water involved in the fermentation and distillation you are lying.