apparently from what i've heard/read corn isn't even a very practical source to use for fuel. there are other sources (wheat, sugar cane and barely maybe?) that are supposed to be more efficient, however, corn is subsidized by the government so there is more of it or something...sort of a catch 22

here is a good article on it i think:
http://www.nytimes.com/2006/05/14/au...mp;oref=slogin