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i ran 89 in my my alero and i noticed the idle quality increased and it did tend to have a bit more throttle response. but its marginal. i agree with mfuller, if you can get no knock out of 89, no point in going higher... unless you tune if for higher.
otherwise just put some higher octane fuel in and let us know what happens!.
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The dumbass that shows up randomly 10 years after selling the car.
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