My '09 is not as bad as yours (it does have the 6 speed tranny and 3.42 gears). A lot of city and a bit of highway will give me around 16 mpg (at least, that's what the DIC tells me). As I posted in an other thread a couple of days ago, I tried a speed test last week while driving in ME. 45 mph gave me the best mpg (around 25), 55 to 60 knocked it down a bit (I think it was around 20 mpg), driving at 75 knocked it down to 18. Speed makes a difference. I change the front O2 sensors when I change the plugs, because I've read that they start getting lazy around 80k, if this is true, or not, IDK.