My Sierra AT4 and my wife's Yukon Denali both have the baby Duramax, I absolutely love this engine in these trucks. I average 26 mpg in my AT4, that's with about 50/50 city and highway driving. None of my past trucks have gotten even close to that. The low end is really nice and has both trucks moving out from a stoplight nicely, they wouldn't win any high speed races, buy they are great for a daily driver and light work duty engine.