Well, I have about 31000 trouble free miles. The only problems that I have had do not deal with the engine. I think you only hear about the bad problems and not the good. As far as overheating and EGR problems, I believe that the trucks affected by that are the 2004-2005 LLY engine. I have the LB7. The MPG is pretty good unloaded in good weather. In the summer, I average about 16-18 around town and probably 19 on the highway unloaded. Around here in AK there are no real highways, just 2 lane roads that go places. If you are looking at getting a used one, make sure you have a VIN check done, so you know what you are getting into. I do believe that the problems are from a small % of the actual fleet sold. It seems you hear about the bad stuff way before you hear about the good stuff. The bad things you hear always stick in your head too. JMO though.