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Uh, engines are made to operate on a certain octane rating fuel, using higher octane fuel doesn't make it run any better. It doesn't burn cleaner aside from having less sulfur, and the mass specific heat of combustion of alkane fuels (and most hydrocarbon fuels for that matter) are within a few percent. Alcohol/other oxygenates will lower the amount of energy in the fuel by a small amount, but the cooler charges that they produce, among other things, tend to increase efficiency even without a compression ratio increase.
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