There is a caveat to this. Nitro can cause premature harm if you have a lean run. Nitro is a monopropellent, that is it can burn with no additional air, however it is hard to ignite. This is why those AA Dragsters have huge magnetoes, to ignite an extreme rich mixture. If they get the mixture to rich, or the mags are weak, then they have cylinders "drop out" or miss. You can see clouds of raw fuel come out of the exhaust when this happens. To get to the point, this is why it broadens the needle and why the engine runs cooler. The nitro will provide more and more power as the needle is richened, but the methanol will provide less, the opposite will happen when you go from the rich side of the peak to the lean side. But when run lean the nitro will instead run much hotter than the methanol, add some detonation and you can quickly ruin pistons, sleeves and bearings.