I don't have a new one but I do have an 05 4x4 crewcab duramax that I never drive unless I have to tow something.
I have used it on a couple road trips though. It has gotten a best of 20 mpg highway, and gets 15-16 mpg in town. Towing a fully loaded 28ft enclosed gets about 11-12 at 70-ish mph and pulling the open flat bed with a car on it at the same speeds gets about 14 mpg.
I was just looking at a brand new 2022 at the dealer a couple weeks ago. Crew cab 4x4 with an $85k sticker on it. I would have expected they would do better than my 05, but the sticker has me keeping mine.
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