I have to say I just bought a 2006 2500 mega cab 4x4 slt and only get 11.5 mpg! makes me a lil sick. I was told 13 city and 17 highway. Ive been driving like an old man! I know i only have 300 miles on it but I dont espect to get any better when the engine breaks in. what do you guys think about that?