Hate to beat a dead horse but here is an interesting article about ethanol. <a href="http://www.scientificamerican.com/article.cfm?id=corn-biofuel-enzymes&sc=CAT_ENRG_20090625" rel="nofollow" target="_blank">http://www.scientificamerican.com/article.cfm?id=corn-biofuel-enzymes&sc=CAT_ENRG_20090625</a>