 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.