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Originally Posted by Igovert500
Old and good, 99+ will kill your performance...you aren't running turbos, so you don't need that extra octane. Stick with 91 if you are in an NA...higher octane doesn't equal more power. The only reason to use race gas is if you are turbo or supercharged and want to turn up the boost WAY up.
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Agreed. Higher octane requires more energy to burn. You always want to use the minimum amount possible without detonation. Also old and good I am assuming your car is auto if those are the best times you are pulling?