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i took a trip this week in my new to me duramax, all i have is a hypertech and I only got 15 mpg. everything is stock, the dealer told me i would get almost 25 mpg.
this does not seem right, maybe it is right but is seem low.
i took a trip this week in my new to me duramax, all i have is a hypertech and I only got 15 mpg. everything is stock, the dealer told me i would get almost 25 mpg.
this does not seem right, maybe it is right but is seem low.
Is this like a short road trip or longer one? I see about 21-22 on the highway with mine.