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Don't understand why your asking the question. There are so many holes. You need to be specific. Like what are you doing with the cummins? Or should I say "what do you want to do with your cummins?"
"Asking about a truck mpg is like checking a prius tow capabilities"
Not trying to be rude at all. Just need more info.Why be rude? This is a forum for people who like stuff to share info right? So how bout we stay polite!
I have a 2014 2500 4x4 and have been consistently (highway and city) been getting 20-22 mpg. Some ppl might say that they are turned off by the slight differences in hp and torque from the manual vs the automatics but come on. When will you ever actually use all that power. If you are really going to be pulling such a huge payload than you probably have a CDL and towing endorsements for trailers which all equates to $$$.
I have been extremely happy with the mileage of my truck. I was expecting 16 maybe before i bought it. Hopefully it goes up even more when she is finally broken in. Honestly i think the difference between the manuals and the autos on a real world scale is all just #s for sales props. Yes no doubt the autos are rated better but again, for most ppl when are you ever going to actually need to translate more than 600 lbs-ft of torque to the ground. My manual pulls everything i have thrown at it like a dream but i never expect to ever pull near its max payload which is like 17k.