We love our Armada. Currently about 65,000 miles on a 2006 LE 4x4. We average 11mpg. Hate that part! We have gotten as high as 14 on long straight roads, probably due to tail winds. We typically travel with a Yakima skybox on the roof (21 cubic foot version), and it does not seem to noticeably effect mileage.
We are on our third set of tires. We started out with the OEM Continentals, hated 'em. Then went with Bridgestone Dueler Revo's, which worked great but wore out faster than anticipated. I think we only got 30,000 miles out of them. Just installed a new set of the brand new to market
BFG Rugged Terrain tires (265/70/18) and they seem pretty cool. Dubbed suitable for "hardcore on road" by 4x4 magazine, LOL.
The middle seat has more room than any other vehicle on the road today, save the $400,000 Maybach. We have traveled long distance with 4 adults, 2 kids, and a dog with plenty of room.
The truck accelerates like a rocket, cruises effortlessly, tows like a champ, turns on a dime, and has great outward visibility. Interior quality could be better, but its held up pretty well for us so far.
We've never done any hard trails in it, but we have taken it to Monache Meadows and the White Mountains above Bishop