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Well, depends on the car. Some cars want premium (see what is on the gas cap or gas area). But the higher octane just prevents premature firing of the pistons during compression. That is why with a spors car you will definitely want premium, especially if it is high compression.
My 2 cents.
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Brian Griffin: Ah, if my memory serves me, this is the physics department.
Chris Griffin: That would explain all the gravity.
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