I too chose Duramax after lurking on this site for months. Thank you. I took delivery of my Chevy 2500HD Ext. Cab LS D/A delivery 09/08/2001. It has had a relatively light duty life even though I've put on 168,000 miles: I live in Monument, Colorado. Drive 100 miles round trip to work and back each weekday. Take two lane roads to Denver; generally travel at 55mph. I get 19 to 20 mpg in winter; 20 to 21 mpg in summer. I also pull a 26.5ft 5th wheel camper around Colorado and surrounding states a couple times a year on vacation. I can achieve 12mpg while pulling if I stay on two lane roads and run around 55mph. The truck still drives beautifully. I run Michellin M&S 265 75 16's and get 50,000 out of them. Dino Oil. It still has the original brake pads all around. Nuetral Safety switch replaced at 38,000, just out of warranty. All the injectors replaced under warranty at 104,000 and again at 119,000 under warranty. 1st replace may not have used the updated injectors. New Batteries 2 months ago. Left front axle seal replaced 2 weeks ago. I figure I spent all my fuel savings on maintenance costs over the years but, I still love this truck. Plan to keep it to 300K miles and year 2012.