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PostPosted: Sat Mar 08, 2014 10:29 pm 
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Joined: Sat Mar 08, 2014 10:02 pm
Posts: 1
Year and Trim: 00' SSEI
Hey, I have 00' Bonneville SSEI. I just recently replaced the lower intake manifold gasket, supercharger gasket,throttle body gasket, and all the vacuum lines. After replacing all these gaskets my mpg dropped like crazy. I was averaging around 19 now for the past 3 weeks I've been between 14.5 to 15 mpg using the same gas and driving it the same as I used to. When I had everything apart I cleaned the lower intake manifold and inspected the injectors and everything looked good. Noticed the instant mpg dropped the day after putting everything back together, and the car is running perfect. I was wondering if anyone has any idea of what could be causing this?


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