Ok here is a link to some interesting information about nitromethane. Read it for yourself, what it does is adds oxygen to the burning process allowing more fuel to be burned, increased compression (heat also) , more power, better idle, if engine is built for higher compression. Wow! Could possibly pick up 100 rpms for each 5% increase in nitro. Or not. Thanks guys.
http://www.geistware.com/rcmodeling/.../fuelfact3.htm
Doug