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Gas Mileage Problem

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  • Gas Mileage Problem

    I knew to the forum and need some help! I have a 1998 3.8L Camaro A4. I can Generally get around 450 (28MPG) miles to the tank.
    I replaced my stock alternator with a high-output 160amp from Motorcity reman. (To start building my system)

    The pulley is about 12.5-13mm smaller. So I went and got a smaller belt. (6PK2384)(OEM is 6PK2397) But I believe the car is still generating drag. Now I am able to only get barely 300(18.78MPG) miles to the tank. HELP!? ANY SUGGESTIONS!? I really don't want to go back to the OEM But I will if that is the only solution.

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