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Good point! The last few generations of Pontiac Grand Prix's/Impala's/Buicks had issues with the top gear going out. If you're down to 2 gears in a heavy truck I would imagine that would really kill the mpg! -Whitey

17-20 mpg on mine. Depends on what kind of driving I'm doing. And coming back from the Aberdeen rally this summer I was pulling 65-75 most of the way on 95 and the Baltimore beltway and was getting roughly 19 mpg.