2024 Denali Duramax Ultimate Mpg

2024 Denali Duramax Ultimate Mpg. 2024 3 liter duramax fuel mileage. I occasionally tow a 28' goose neck with a 6115 john deere tractor and get 10.

28 to 29 mpg at 70 to 75 if i do 80 it will drop to 26. Took it in and was told bad.