2025 3.0 Duramax Mpg

2025 3.0 Duramax Mpg. This is every fill so far. Looking at a new 2025 at4 and just curious if the 10 speed transmission helps with mpg.

Much of a recent trip (5000+ miles, aug 2025) was at higher than usual speeds and dropped lifetime to 29.2. 2 posts · joined 2025.