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i agree w/ tom that octane boosters won't do much for the total octane rating of the gas in your tank. most cans of octane booster are like 12 - 16 oz. to boost your entire fuel tank by one R+M/2 number takes over a gallon of commercially available lead free additives.
another trivia note: octane converts to heptane if it sits for a long time, so if you buy 93 octane from a station that sells very little premium fuel, it's probably 90 or 91.
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