Thanks Boatguy, for all your info..
I currently have a 2013 Denali with the 6.2 gas glutton and i do drive quite a bit - 75% highway 25% city. So much so that I don't even look at the gas pump anymore. I just swipe my card and pump to full - i'm too afraid of becoming depressed over how much $$ i spend in gas every month.
Things I love: power assist steps, moonroof, all that lovely, lovely horsepower.
Things I don't like: cheap plastic bits (buttons, knobs), 3rd row leg room, removing 3rd row seats is a PITA - those things must weigh 75lbs each.
My boss actually has pretty much the same vehicle but with the 5.7L and he really wishes he went for the bigger engine.
Right now, i'm really torn between a 2017 Denali and a 2018 pre-owned Expedition. The Expy Limited is actually about 5k cheaper, but the Platinums are about 10k more expensive. The 2018's are apparently a lot more luxurious... i'm not excited about losing HP - i believe the Expy's have 375 in the turbo V6 (another thing i'm not excited about - losing 2 cylinders).
I haven't been able to take one on a test drive yet.. will be doing that sometime this week.
As an aside, I moved from the stock 20" to aftermarket 22"s on my Denali.. back in March, I went in to buy new tires at Discount Tire and told the sales guy that my priorities were: 1) comfort/smoothness 2) handling 3) stopping distance
He had some new software tool that sorted on preferences and popped up a set of Yokohamas - they are like a dream on smooth roads. It really feels like I'm gliding down the highway. I'm really, really happy with those tires.
I'm checking the receipt and they are 285/45 R22 114H XL BSW Looks like model# YK-HTX
Paid 832 for the set of 4, not counting warranty & installation.