I just posted over in the 2005 forum but after filling up last night I realized that I got 21 MPG city in my 05 S on my last tank. There is no way that I am dumping the X!! 21 mpg is not to much worse than what I was getting with my Sentra Spec-V (23 city)and I had to put premum in that. I'm driving like a grandma but it works