I have started to improve my gas mileage by about 20% (as you can probably see in my tag, I DO have the V6 model). I had been able to get about 20 mpg on the highway driving ~65 mph with the cruise on. By drafting semi trucks (or anything that blocked some of the head wind) and dropping my speed down to 60 mph I was able to get 24 mpg. I used a fuel injector cleaner and that seemed to help a little bit, in addition to keeping my tires at about 32 psi.

Like always the city mileage is terrible at best, but thats not why I bought it. Hope this can help some one. Let me know if anyone else can confirm this or offer some advice. The X will never be a Camry, but then again a Camry will never see more than some nice pretty pavement.