2025 Gmc Denali Duramax Mpg. I understand this is a long way from your 2025 question but this is my experience. Detailed specs and features for the 2025 gmc sierra 2500hd diesel denali ultimate including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine.
Speaking of speed, the revised duramax makes for a noticeably quicker silverado. This is the first time i got a def message on the 2025, but i remember my 2020 would first come with a 1000 mile message.