Just to back up what DEUCE_454 said. Propeller driven airplanes use AWI (a mix of water and methanol, 80/20) to boost performance. The Metro I used to fly gained 100 shp when it was used for take off. Then again that was in a TPE3311G-11U turbine engine that turned at 41,550 RPM. Not sure what the gain for you would be but it does work and it's great on those hot summer days.
__________________ Curtis
Pilots: We're not better than you, just way cooler.
Brian Hobaugh SCCA National Tour June 2014
First Hemi 'Cuda Convertible Ever Built
Short clips: Goodguys Pleasanton autocross and pit videos
Threaded Mode