Got my X the first of July ('03, 4X4, 3.3L V-6). Currently have about 2400 miles on it so far. Haven't kept great records, but mine is averaging around 17MPG in mostly town driving with some highway. My old truck ('00 Frontier Crew Cab, 3.3L V6, 2X4) ran about the same going up to about 20MPG on the highway. I agree, and noticed the same with my Frontier, that the mileage will go up some after the first oil change. So I expect mine to go up slightly in a couple of months. I'll try to report back after my first oil change and I find out if it did.

BTW - With the way the 4X4 system works, as long as you keep it out of 4WD and keep the XFer case unlocked, why should the mileage be lower than a 2X4? Technically, aren't the same at this point?

Someone mentioned using Mobil 1. What does this do to the warranty? How did it effect your mileage?

Gonzo