Quote:
Originally Posted by lbnaz
Does anyone have a new HD Duramax to compare fuel mileage with. I purchased a new one a 3500 srw longbox 4x4 High Country and the fuel mileage has only been 10.9 to 11.6 in town driving. I'm still breaking it in so I haven't pulled a 5th wheel yet to see what that brings. I've got 900 miles on it and still the same mileage. Had it checked for any codes or software updates there are non currently.
I know you don't buy these trucks for economy but I traded in a 2020 same truck and it got 18-19 city average (best was 21) and it got 12.9 to 13.5 pulling a loaded 5th wheel. To many other electrical and mechanical problems with it to keep it. Now I'm missing it. Thanks, Larry
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You are not missing anything Larry, I am having the same results. I have owned several 2500HD Duramax trucks, a 2006,2015,2019,& 2022. Out of all of these the 2019 got the best mileage and 2022 in significantly worse. My 2022 only has about 1,700 miles on it and I haven’t had the chance to tow anything large yet, but both in town and highway MPG is about 2 - 3.5 less than the 2019. I love the 10 speed transmission and all of the tech, but the price of ownership is noticeably higher than it was with the 2019. Without a trailer my 2022 is getting about 13.5 in town and 17.5 on the highway. My highway mileage consists of my weekend trips form PHX to Northern AZ, 150 miles so there are some pretty long grades to climb. If I behaved myself, the old 2019 could deliver 20 mpg on the same highway trip. I don’t regret buying the new truck, just surprised by it inefficiency.