2022 Chevrolet HD Duramax

[x33rs]

Originally Posted by azcamaros

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.

That's the same highway trip that I get my mileage from. My 05 does 20 mpg empty if I keep it at 70-ish. If I drive stupid to keep up with traffic at 85-ish it only drops to the mid 18's for MPG. Same mountain grades I pull the trailers on.