I've seen all kind of results on this topic, but my fuel economy hasn't been all that great (12 city). If I drive it like there is an egg under the pedal (pretty hard for me lol) I can get 14 in the city. Hwy is all dependent on what speed. HUGE difference from 55 - 75. 55 will get me 17-18. 70ish more like 15-16. Much higher then that and it drops off fast (13-14). I really thought my tune was way off until I seen this article. Now I feel much better----they just suck on fuel economy - lol!
http://www.caranddri...est?redirect=no