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Some background, have owned and driven Suburbans and Denali XLs since 1995. Have owed 16 of them. Bought a new AT4 (Yukon...not the XL) on Halloween. Have since put 3,500 miles on it. Some observations: 1 - Even though this is the first short wheel base (ie Tahoe - Yukon), I do not notice a difference is drivability other than having the extra garage space. 2 - The new transmission is a huge improvement over by 2017. No more hard downshifts from 2nd to 1st that could never be fixed. It is smooth and you are not aware of any up or down shifts. Even with the smaller 5.3 (versus my old 6.2) the new trans has plenty of power and I do not miss the 6.2. Have not towed yet but based on ratings, the smaller engine can tow more weight. 3 - Fuel mileage is still lagging my old 6.2 but is getting better as the motor breaks in. Last highway trip averaged 16.3 MPG (at an average of 75 MPH). 2017 would average nearly 19 on the same trip. 4 - Two minor electrical issues (both fixed). First, the infamous air bag warning light caused by a too short wire pig tail problem. When I had the issue there was only a service bulletin and handled by dealer quickly. There is now an official recall on the issue. Second, all four TPI sensors disappeared one by one. Dealer reprogrammed and working great. Note the 2021 models are suppose to programs themselves. Didn't happen. 5 - The new rear suspension really improves the ride when empty but not really noticeable when carrying a fair amount of cargo. The extra heigth in the rear cargo space is usable and noticeable. Same with the third row passenger comfort. 6 - The inserts on the seats really break up the blackness of the interior and a unique touch. Nice. Likewise, the LED lights on the bottom running boards work well. The 2nd row cupholders (on the rear on the console) are a huge improvement over the 2017 model that had them in the doors. I can now actually see the HUD wearing polarized sunglasses (not 100% but readable)...before the HUD would disappear totally. Have not tried out the rear entertainment screens yet. The all around cameras allow my 5'0" wife to drive the AT4 and feel comfortable navigating it in small spaces. 7 - The air suspension puffs up when you approach and deflates with several "burps" when you walk away. Takes a bit of getting use to. 8 - Never been a fan of dark colors but bought my AT4 in the dark blue. In some light (ie my garage) it looks black, but a brilliant blue in the sun. Great color! 9 - Have yet to see another AT4 Yukon on the road. I live in Texas where there are lots of Suburbans and Yukons. I like the exclusivity of it. 10 - Suggested improvements to GMC? Move back the power window switches on the drivers door. The natural reaching for them means I always seem to open the rear window instead of the driver's window. Move the override button for the auto stop feature to somewhere easier to get to (hidden below and to the left of the steering wheel). Give an option to set the air ride in a position and have it stay there. The retractable running boards retract too fast. If you open and close the front door they retract before you can even open the rear door. Mark me 100% satisfied to date!
