Well, Ernie Rojers taught me a new term called "well to wheels", but the answer is a horribly complicated and incestuous mess.
http://ecomodder.com/forum/showthrea...-evs-8099.html
There are even those that will insist riding a bike is worse than driving for that matter, and the agendas are not very bashful.
Best you can do is pick your fuel and keep beating your high score.