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Originally Posted by ricky.agrawal
In america, you're supposed to use whatever the manufacturer suggest.
Anything higher won't do jack diddily sqaut on a stock car, because the engine timing maps won't take advantage of it. They will only compensate for lower octane fuel.
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So if this is the case, then what you are saying is that it is true that higher octane doesn't do anyhting for us unless we re-tune our cars for the higher octane. If so, then is there a difference for us between 87 octane and 91 since we can't really take advantage of the the octane difference?