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I have a 2012 Ram 3500 DRW with the 3.73 and max tow package. Towing 16,455 lbs mine will hold 6th gear through the normal smaller rolling hills, but put any significant grade on it and it will drop to fifth or fourth if necessary. I too noticed that the fuel economy is not where my Duramax Chevy's ran. With speeds mainly the same, load is within a 1,000 lbs, I went from 12-13 mpg down to 10-11 mpg with this Ram. I attribute that to all the EPA exhaust garbage they have put on the newer trucks. Hopefully your dealer will find something.
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