Nitropropane has been used instead of nitromethane in some cases, but it will tend to run hotter than nitromethane and not give as much power enhancement. We tested fuels with nitropropane a number of years ago when a large nitromethane plant in the US had a fire that put it out of commission for several years. One of very few nitromethane production facilities in the world. Nitro was very expensive for several years after that, and the supply of higher-nitro fuels became scarce.