Welcome from another GMT800 Denali owner. I looked at several models across the platform and I’ll still take my 6.0 over a 5.3 Tahoe or 5.3 Yukon any day. The 5.3 is a solid engine. Good option. But the 6.0 is a crazy fun motor, easy to work on, for maintenance, repairs and upgrades as well. like he said above^ gas mileage is minimally different. Not enough to notice. The full time All Wheel Drive has its limitations but there isn’t much it can’t handle. I live in a ski town and run in snow for roughly 4 1/2ish months a year. It’s not met much that has stopped it in the snow. And we just had the storm of the decade late February, 10 feet of snow in 10 days. We’re just not equipped to handle that much snow all at once. Denali ran through it totally fine.