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Regardless you would probably see some performance gains, but at what cost (other than fuel)?
I wonder how that'd treat my 91 APR program...anyone with the 91 APR program use 100 before? Any appreciable difference in performance?
Andrew, I think you are thinking of running 100 octane Mode with 91/93 gas. With this, it is bad. You are running faster timing than the gas can ignite and you will get misfires, and other badness... but running slower timing with higher octane gas will give your car small gains, but nothing worth the $$.