Anyone out there have the late model GM pickup with the LML Duramax? How do you like it? Had any issues or problems? I picked up a 2011 GMC Sierra w/ the Denali package last weekend. Thus far it's getting 21+ mpg on the highway/ 16.6 mpg around town. I plan to leave it stock, as it sits it's plenty of truck for me. I stepped up from a 2000 Ford F-250 7.3 supercab 4x4 to this, it's hard to believe the differences in the two vehicles (NIGHT & DAY). I'm looking forward to a road trip soon, and possibly dragging the GN around later in the year. My wife is crazy about the truck, I guess I need to hide the keys.