2025 Gmc Yukon At4 Diesel Mpg. The diesel engine is predictably more efficient, earning ratings of up to 21 mpg city and 27 mpg highway, but these figures are most likely to shift due to the updates for 2025. Get accurate pricing information for a new 2025 gmc yukon 4wd 4dr at4, and explore other options.

Check out each powertrain and its respective specs available for the yukon and tahoe below: The motortrend buyer’s guide has the 2025 gmc yukon xl specs you need, from dimensions and cargo space to power and mpgs.