Originally Posted by wingracer

Here is the wiki page on nitromethane.

http://en.wikipedia.org/wiki/Nitromethane

As you can see from this info, nitromethane is explosive. Also, since it is an oxygen carrier, it requires less oxygen to burn. Since we don't usually reduce the carb venturi when going up in nitro % this will require a richer needle setting (same amount of air will require more fuel) therefore fuel mileage is reduced.

I have to agree with Roelof that more nitro is easier to tune up to a certain point. It will be much easier to tune a motor on 30% nitro than it will be on 5%. However, it would probably be quite difficult to tune them on really high % nitro simply because our motors are not designed for it. Now if we increased head volume and made numerous other changes it would probably work OK but no one I know has ever tried it.