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lmm mpg

  1. Aftermarket Mods.
    Any thoughts/experience with a tuning kit to improve mileage on an LMM? My 2500 HD is just a 2 wheel drive and the mileage isn't too bad now - avg 19.2 overall and about 20.7 on highway. There seems to be a lot of kits out there and from what I read I like the products that Diesel Domination...