[2.2 Straight six]

you'd be better off looking into chemistry for the hydrocarbon and homologous series stuff, that explains the formation of it. otherwise just google and look around. Brazil i think is the largest user of ethanol powered cars, since they can produce up to 8 billion gallons of ethanol from sugar cane every year.

the reason it burns cleaner that petrol/gasoline i that the molecule of ethanol already has oxygen in it, so when it burn the oxygen already on there helps for C02, instead of CO which can be formed under conditions where incomplete combustion occurs.

PM if you need more...