OK, real world numbers: 2011 Chevy 3500HD Dually, Duramax/Allison. Towing 17K plus 9 to 10.5, average about 9.5. When solo around town/stop-n-go about 14. On the open Highway solo 18 to 20 if you keep it under 70 (usually 62 to 65). So by all rights, a 2500 should do a little better since it's not turning the extra set of tires.
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2011 Chevy Silverado 3500HD Ext Cab LT DRW Duramax/Allison pulling a 2012 SOB (still Thor, but not a Keystone), Dual ACs, 4 Door Fridge, Fireplace, Sleep Number Bed, Level-Up Auto Levelers, Disc Brakes, Winegard DirecTV SlimLine Auto Dish, Onan 5.5K, Splendide Combo Washer/Dryer, GY G114s on HiSpec 17.5 wheels, TrailAir Tri-Glide Pin Box, Mor/ryde IS.
Michelle & Ann Sullivan and 4 American Shorthairs
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