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Car manufacturers tell you what octane they recommend. That is what one should go with. Going higher will just cause you to pay 10-15c per grade per gallon extra. Might not sound like much but if you fill 15 gallons with high octane and pay 20c extra per gallon you pay an extra $3 for absolutely nothing.... instead take the $3 and give it to the homeless man at the end of the fuel station driveway... at least he could put that toward buying himself some booze.
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