I pull with a 2007 diesel 3500 dually and it get 12 to 14 towing an enclosed Featherlite and 20 without the trailer. I also have a 2018 dually with 6.2 gas that gets 10 pulling same trailer and up to 16 without the trailer but the power is considerably less than the diesel. When I get in the hills the gas is downshifting seems like a lot to me. I am seriously considering taking the gas 2018 to Hodges and have a car hauler bed installed, maybe then it will ride better. That 18 is the roughest riding damn truck I have ever owned.
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