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It's always been my experience that a car that recommends a certain grade of gas from the factory will not produce any more power if you use a higher octane. Everybody is pretty right in saying though that if you mod the car with forced induction or a higher compression it is a good idea to then run a higher octane.
I had to yell at my Mom to stop putting it in her Tahoe. She was convinced the engine would last longer if she ran premium. I also had to yell at my Dad to start putting premium in his Celica GT-S after he got sick of paying extra for it.
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The Man in Black fled across the desert and the Gunslinger followed.
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