1. An Xterra is shaped has aerodynamics of a doghouse. It is not sleek.

2. The Xterra has 4.63 or 4.90 gears, Not 3.70s.

3. It's a 4000 pound vehicle empty. put 4 adults and your added an easy 600 pounds to it. Then the gear and mods you can do. An easy 5000 vehicle your driving now

I am getting sick and tired up of the bitching about gas mileage! I guess you should have bought a Honda Civic.
Food for thought, I tow a small pop-up camper, I get from 12-13 MPH loaded with my family and gear and dead winds. I get 17.5 MPH with my family of 4, an automatic, misc drag options on the roof and 31s. Next year it will drop again due to pulling a small boat behind the camper. I use my X for what it is made for. One of them is not being a Honda Civic!
Dan