The Xterra is a truck SUV, not a crossover SUV, meaning its body is attached to a boxed-in steel ladder frame and uses a rugged suspension, double-wishbone front and solid axle with leaf springs in rear. It's the same chassis as the pickup.
All Xterras use a 4.0-liter V6 that is powerful and well proven. In 4WD with the optional smooth five-speed automatic transmission it achieves 15 city and 20 highway miles per gallon, a bit more with 2WD or the standard six-speed manual transmission.
An Off-Road model is available that will go pretty much anywhere. It comes with Hill Descent Control, heavy duty trail tires, and skid plates. The electronic 4WD system is part time, with three functions available: 2WD, 4WD High and 4WD Low.
The JB car pages provide engine and transmission specs, as well as gas mileage and dimensions for all 2009 Nissan Xterra versions.
2009 Nissan Xterra SUV Specs & Features