The Rochester Institute of Technology just released an E20 (20% ethanol blend) study (link to news brief: http://www.rit.edu/news/?r=47447). Results: average decrease of 23% for carbon monoxide and 13% for hydrocarbons over 100,000 miles. No vehicle component damage from E20 useage. All vehicles were non-flex fuel or in other words normal gasoline engines.

 

Very interesting! Thanks for the link.