This is my fav topic and a great thread. There isnt a problem as far as i know because the car industry is very, very far ahead in terms of going green. There are so many people out there working on alternative fuels for cars, I have read and heard about most and the best possible solution at the moment is a direct replacement fuel that isnt going to destory your engine. It also has to offer the same sort of performance. There isnt a shortage of alternatives and word on the wire is they are working on a fuel that is a chemical mix between butanol and ethanol so invest in a distilling company and relax.