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We tested a lot of different fuels over the years. The fixed head 26 cc gasoline engines don't benefit from much but the lowest cost fuel. You need to be able to optimize the compression, ignition timing, and especially the pipe design for each fuel. When you can only change the mixture the graphs below show what happens. Note that the ethanol fuels seriously lower power if you don't richen the mixture. The variation in peak power is probably not significant, though but there is variation in the low end and over rev area. By the way, the tested E10 was actually 30% ethanol, the E85 was 60% ethanol and the 92 octane was 8% ethanol.Lohring Miller