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			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.
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