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Another aspect is the ECU learns how to adjust timing to prevent knocking. It makes sense the effect will be near immediate if knocking is detected and much less immediate going the other way. I have no idea how much higher octane fuel it takes to return to optimum, but my guess is it’s going to be more than one or two tanks full.[/QUOTE]
That makes sense if the ecu has detected knock it will stay conservative and the longer it goes with out knock the more it will advance timing. I have read where tuners say it takes at least a thousand miles to fully adjust to higher octane. I used 87 for the first ,18 k miles on my v6. Since then been using only 93 , now at 57 k miles. It runs better, smoother , has to be better for the engine. If I never ran it hard 87 we probably be ok.
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