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  1. Duramax First Generation: 2001-2004 (LB7)
    03 2500 HD duramax . Is their any thing I can do fix the difference between the dash and real mileage? The truck says it gets 21.5 but only gets 12 . The tires are stock speedometer is on with GPS any help would be great to get fuel mileage up .
    lb7 mpg
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