2025 Yukon At4 Xl Review. The gmc yukon and yukon xl are being updated for 2025, with better seats, bigger screens, the biggest wheels ever fitted to a gmc product, and a whole host of firsts. This engine returned 17 mpg overall in our tests of the 2021.
The yukon xl denali keeps its lineup simple with elevation, at4, denali, and the new at4 ultimate trim. It offers three engine options: