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KT - I don't know what the altitude is where you live, but the higher you go, the thinner the air. What this does, in effect, is lower your compression and that is what would allow you to use a lower octane without pinging.
At 5000 feet, 89 octane is the equivalent of 91 octane at sea level. If you're going to try it, I suggest you get a bottle of octane booster ahead of time to put in if she starts pinging.
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Don
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