This is our second Yukon. We love the car. It has lots of space for our 3 kids and 2 dogs. We have the third row seats and they are easy to fold away when we have to haul a bigger load. The gas mileage is actually better than a Toyota Sequoia or any other SUV in its class. We love it and will purchase another one next time we need a car.
The Yukon Denali is overall a great car. Our other car is a 2008 Town and Country Touring Edition. That van had been the kids' favorite until we got this car. Now, the kids don't want to ride in mommy's car anymore. It has plenty of seating (3 rows, seats 7 with the middle row of seats having bucket seats) and features galore, from heated, memory leather seats and sunroof to DVD player and plenty of power outlets. The performance is great, with LOTS of power and passing ability. Just be careful, because it's very easy to get going faster than you realize it this vehicle. Set the cruise control whenever possible. There are only two drawbacks to it that I have found. One is that there is virtually NO space behind the back seat, maybe a foot between the third row of seats and the liftgate. I usually keep the third row folded up to create more space for groceries, etc., unless someone is riding back there. That will have to stop soon, however, since we will be having our third child soon, and our oldest child will have to move to the back. The space problem would be better if we had the XL (extended length) version of the Yukon Denali, but that would make for a tight fit in our garage. I replaced a 2007 Chevy Trailblazer with this standard length Yukon Denali. It adds a third row of seats and is only 9 inches longer than the Trailblazer. It also adds 1700 pounds of towing capacity (8300 pounds vs. 6600 for the Trailblazer), which makes me very excited to hit the road with our travel trailer. The Denali XL is considerably longer, which would help with the tight space in the back, but it would make the other problem with the Denali even worse. My Denali gets only about 13.5 MPG so far, with mostly city driving, and that is using a very light foot on the gas. More "normal" acceleration gives about 12.5 MPG in the city. On the highway, I'm lucky to get 17 MPG. That is the tradeoff for getting a huge, heavy SUV with lots of power and capabilities. These numbers seem pretty consistent with other very large SUVs, so if that is what you are looking for, you'll have to live with high gas bills no matter what model you get. You can't have it all, right? The quality has been great so far. The fit and finish is good, with no noticeable gaps inside or out, and overall the materials in the interior are nice. I have had no problems or complaints with any mechanical systems, either. Overall, I would highly recommend this vehicle to anyone wanting a strong, comfortable, feature-loaded car, as long as you can deal with the poor mileage. If getting good gas mileage is at the top of your priority list, you should look elsewhere.
Okay, so I have similar vehicles prior to our Yukon Denali such as the Lexus GX470 and BMW X5. I must say that AWD was a must for me and I wanted the luxury of the Lexus. Well I will be honest. The main reason I picked a GMC was because I wanted to make sure that town I was moving to could service the vehicles I owned. To my surprise when I moved from FL to WI the ride was great. 2 Adults 5 kids on a 2 day road trip and it was comfy. Power to spare. gas mileage is sub par but then again it is the same engine as the Z06. I am a fan of GMC. I would like to look at the newer one but our 2006 drives like new.