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Old 10-26-2012, 12:01 AM   #3
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Join Date: Jun 2009
Location: Such City
Posts: 5,627
My Ride: '02 Dogemobile Shibe
High compression engines require high octane. When you compress things, they get hotter, and a higher octane rating will prevent spontaneous combustion from compression. If you use a lower octane, your car will compensate, but you will lose gas mileage as a result.
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