Grandpa, I own a 2003 Duramax crew cab. What a FANTASTIC vehicle. I also have all the bells/whistles (leather, heated seats, Onstar, etc) I do not have the XM, but wish I did. I have about 53k miles on it and have not had one mechanical issue! It pulls my 8500lb boat very well. I even forget the big thing is there! The only three issues I've had are w: The A.M channels all stink and FM isn't much better.... I also had an issue with the tapedeck (fixed under 36k warranty) . Lzstly the drivers side running day light doesn't work. It's not the lightbulb, but some other issue. If you look at 2001-2003 Chevy's you'll notice half of them have this problem with the running light?? I get about 19mpg average w/60% highway miles.

On another note, I've noticed w/in the last month or two that Diesel is now MORE expensive than SUPER Unleaded? It was always at or less than regular, but something recently changed. Anyone have any ideas? I've noticed it at more than a dozen stations in the state, so it's not just a local thing???