I'm now a Duramax newbee. Been Ford for years, but saw, drove and fell in love with my 2008 2500HD. Had it for about six months, and am completely satisfied.
Just finished a 3000 mile trip to Arizona and back running empty. Averaged 18.8 mpg through Oregon, California and Arizona. That GMC gave me the quietest, most comfortable trip of my life. I hate GM for their business practices, but they build one fine truck.
Now, to keep this real I admit I have some concerns based on the simple fact that if it's mechanical or electrical IT WILL EVENTUALLY FAIL. Soooo, today I install my Edge Insite CTS, and have found one injector with a ballance rate of 3.7 (should be always be less that 4). I'll be watching that one closely.
Over the next few months Edge will allow me to collect and store data on nearly all critical engine inputs. I'll download the data, and use it to establish a baseline for comparison and evaluation. By next spring when I hook up to my 29' fifth wheel I'll be in as good a shape as I can be. In addition, the stuff I'm learning about that truck is fascinating and makes sense including the DPF. Edge will let me monitor that too. I'll keep you posted on what I see.