Quote:
Originally Posted by jrhagen
High octane gasoline burns slower than low octane gasoline. The slow burn prevents engine knock when cylinder pressures are high. If your engine runs well and does not knock or ping on low octane gasoline, there is no advantage in switching to higher octane gasoline.
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I think it's more a parameter of ignition temperature so when high compression ratio and heat are mixed with the fuel it won't ignite before the spark is met. It may burn slightly slower but that's a side effect, not the main reason to use it.