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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.

Want to inexpensively raise your octane in your driveway to see? Go here:
http://home.kscable.com/ssutton/miata/engine/toluene.html

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.

EDR
 
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