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Re: Fuel and Mileage
GM and we recommend that you run premium unleaded gasoline only but lower grades can be run in emergency situations only. From my experiences the mileage is better with premium versus running mid-grade or regular. Since this is a supercharged SIII 3800 engine you will run the risk of getting detonation which will cause knock retard (KR) and a loss of horsepower and performance.
But it is your decision. Your car and money.
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