My understanding of octane is that too little octane causes knocking, and too much octane causes a build up in the engine valves. The car is designed for a particular octane, and a higher octane doesn't do anything for your car. It won't make it go faster nor produce more power.
At least that is my understanding. Perhaps others may have more information, but I've been told that it isn't a good thing to provide too much octane forthe engine.
Good Luck
JBG
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