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  1. 10-29-2013, 10:26 PM

    Thread: duramax mileage improvement?

    by Prince Valiant
    Replies
    37
    Views
    37,189

    Gap the sparkplugs. That'll net you 2mpg right...

    Gap the sparkplugs. That'll net you 2mpg right there.
  2. 10-23-2013, 10:39 PM

    Thread: duramax mileage improvement?

    by Prince Valiant
    Replies
    37
    Views
    37,189

    Make sure you perform the driver mods too...

    Make sure you perform the driver mods too...
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