alright i own a 1990 suburban 2500, 6.2 litre engine... it gets on average 16.5 mpg in the city and 14 mpg highway. i was wondering if i got straight open exhaust on it if it should get better mileage... i've heard that diesels don't require any back pressure from the exhaust to run right but i had exhaust on it a while back and it seemed to get 10 mpg anywhere!?!
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