Which diesel pickup is the most fuel efficient?

I’m looking into purchasing a used (2004+) diesel pickup. I am interested in modding the truck for better performance as well as fuel mileage, and was wondering which trucks average the best mileage with minor modifications (intake, chip and exhaust)

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2 Responses to Which diesel pickup is the most fuel efficient?

  1. pbleek May 13, 2009 at 10:14 pm #

    Most efficient is the GM Duramax, followed by the Dodge Cummings and in the last place is the Ford Navistar.
    According to a magazine test I just read.

  2. Robert B May 13, 2009 at 10:14 pm #

    the best is the powerstroke.then the cummins.buy the ford.