After I got the BA software upgrade, my mileage went up as well. I think they are onto something and are getting things figured out. I unplugged my EGR and just doing that increased my intown mileage by 3 mpg. Loaded, highway stayed the same

 

That "drive it harder"saying doesn't work. Friend of mine has an '08 and he drives the ever living crap out of it. Unless he's going through town which isn't very often the speedo stays at 75 or above even when he's pulling a trailer and carying a ton of tools. His emissions stuff went out, dealership fixed it, 3 days later the engine light came back. He deleted everything and still had problems. Last I heard the truck was on a flatbed headed back to the shop.