cbw 
2010 Nissan Xterra SUV S 4dr SUV (4.0L 6cyl 5A)
Tough
 If you want to increase your mileage, toss in a K&N filter.  I am getting 19 in town with the air on.  I can't complain too much since I did upgrade from a car.  Sure you are going to burn a little gas, but it's worth it for a compact SUV with a fully boxed frame.  The ride is quiet even @ 80,90, 100, it's a rock.  