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  1. pepper
    Thread

    chips for more mpg

    I just purchased 2007 2500HD crew cab. Current fuel economy is 14 mpg with about 75% of miles on the highway, driving 5mph within limit. I'm...
    Thread by: pepper, Feb 20, 2007, 6 replies, in forum: GM Duramax 6.6 (LBZ | LLY)
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