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My trip computer always shows very optimistic mileage, so I do a manual mileage check. Generally, 21 or a bit better, and 9-10 towing @ 60 MPH. Sometimes better depending on the wind.
For the OP, any brand should do depending on his personal preferences. I'm a Cummins guy, but like the Allison for an automatic. Get a diesel with an exhaust brake. The turbocharger will be less affected at higher elevations going uphill and the exhaust brake will better control your speed while descending...all this with better mileage than a gasser.
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 Desert185 🇺🇸 (Retired Chemtrail vendor)
-Ram 2500 QC, LB, 4x4, Cummins HO/exhaust brake, 6-speed stick.
-Andersen Ultimate 24K 5er Hitch.
-2014 Cougar 326SRX, Maxxis tires w/TPMS, wet bolts, two 6v batts.
-Four Wheel 8' Popup Camper.
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