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2008 Chevy 2500HD Extra Cab D/A.
We get 10-14 mpg towing depending on terrain pulling a 2007 Cougar 311. 18-22mpg empty. Slowing down to 55 mph puts us more in the 13-14 range. Plenty of power and no complaints here. Did install Firestone A/B a few years ago as I have a 52 gal auxiliary tank in the back which adds about 500# when full. (The stock 26 gallon tank doesn’t have a great range plus it’s handy for the Kubota tractor.)
Use tow/haul and cruise when I can 65-70 on highway. Taking delivery of 2013 Montana High Country 318RE next week and would expect same mpg or close to it as the weight is quite similar.
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