http://news.pickuptrucks.com/2009/08/first-look-2011-duramax-diesel-v8-engine.html
This is kinda ridiculous..."To ensure that the exhaust fluid tank is refilled, Duramax-equipped trucks will warn the driver when the fluid is down to a 1,000-mile range. A series of start-up warnings -- including lights, chimes and messages -- will become more frequent until the tank is empty. If the driver continues to operate the truck with a dry tank, after a final warning and restart the truck will only operate in a “limp-home” mode that limits speed to just 5 mph until the tank is refilled."
What if youre in the middle of nowhere with no way to refill? Or in a small town with on refill station?