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By Ace (Guest Post)
February 25, 20060 found this helpful

If you have a car designed for 93 octane and you use 87 octane you will loose gas milage and power. If your car is designed for 87 and you use 93 chances are your engine will almost never detonate(knock/ping) resulting in 0 knock retard and giving you better gas milage and power.
This isn't an exact science if your car requires 87 and you use 87 its still going to detonate from time to time. If you into driving to the store to get cigarettes and lottery tickets and chirch on sunday then a little knock retard is fine but if your into driving fast and you want all potential power out of your engine at all times then use high octane.

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