2025 Gmc 1500 Diesel

2025 Gmc 1500 Diesel. See the complete list of 2025 gmc sierra 1500 changes, updates, and new features here at gm authority. With the diesel, the sierra is rated as high as 26 mpg combined by the epa — a high mark for the gmc, and likely worth the added cost you'll pay on some of the lower trim.

Find information on performance, specs, engine, safety and more. The diesel pulls strongly, feels refined, and returns 23 mpg overall.