That's pretty much why we went with the Suburban. My thought was, "If I'm going to get 11 - 12 mpg anyway, I might as well be comfortable."
Driving the Suburban is like piloting my living room couch down the freeway.

(my sister and brother-in-law borrowed it last weekend and they said it was more like driving their WHOLE LIVING ROOM down the road.

)
I was toying with maybe the shorter Tahoe (since it's just the wife and me, kids are all grown) but when I looked at the numbers I realized that the Tahoe and the Burb get just about the same MPG but the 'Burb is 2' longer and has 5 more gallons in the tank. Also having a 14" longer wheelbase it tows better on the freeway.
No, it's not fun to park in a big city (though I parked in downtown Seattle in the middle of rush hour last year!) but for everything else it's been perfect.