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what others have already said...use the octane that your engine and manual call for. As your engine gets older, it may start to ping. Kinda sounds like that little ball in the spray paint can rattling around. At that point you need to upgrade to the next highest grade of gas to keep serious engine damage from occuring. If you are at the piont where you are forced to go up a grade, chances are you wont notice a difference in your wallet. The extra 10cents or so a gallon i pay on medium seems to be made up for by the slightly better mileage i get now that im not pinging.
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Dont cry kid, It's not your fault you suck.
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