It is best you run the highest octane you can.The higher it is the cooler your engine runs.Lower octane fules burn much hotter by nature and when you run it inA high compression 2-stroke, You generate excessive heat and it will burn out your powerhead.The physics of it is,92 is the size of the OCTANE carbon chain. The more carbon in the chain the cooler it runs. Detonation comes from excessive engine temp. and A fuel that ignites at A lower temp. and yealds more heat. Think about what dragsters run or (av gas) for air planes. They all run the highest 0ctane possible