Bought it used with 6,000 miles and have put 1,000 miles on it, so far, in ONLY urban driving and am getting 17.4 mpg. Bought the 4wd as I usually spend most of the weekends off of the road (including dirt roads - REALLY off the road). I have previously purchased new a 4wd 2001 Xterra and a 2wd 2004 Xterra. This is the best so far.
Power is the feature that is the most fun. The vehicle maneuvers very tightly and crisply, and its size makes urban driving and parking pretty easy.