I use a high octane gas and believe it gives better gas mileage. Has any testing been done to determine if 87, 89, or 93 octane will affect mileage on a 2003 grand am
I use a high octane gas and believe it gives better gas mileage. Has any testing been done to determine if 87, 89, or 93 octane will affect mileage on a 2003 grand am
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