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110 Octane & 15/16 Wheels

Interesting question, but you're mixing two variables that should be considered separately.

I would venture to say that you will see little to no difference in performance between either tires or fuel octane.

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If you're considering upgrading wheels to 17/16 for additional performance, you're spending your money in the wrong place. For the price of a good set of wheels, you could put in short gears and 4.55 ring & pinion.