I bought this truck brand new in February 2008. This is my first diesel so I wanted a cummins. I pull a 40 foot fifth wheel camper trailer. About 2 months after I bought the truck I started having trouble with the particulate filter on the exhaust system. The dealer I took it to told me that I didn't do enough heavy pulling to keep the filter cleaned out. Not everybody buys a 1 ton to constantly pull something with. The truck gets pretty good mpg, averaging about 8 mpg loaded and about 16 empty. I am not at all impressed with the 6.7 as it has less than 32,000 miles and is currently in the shop for the 3rd time. I've had lots of issues with the exhaust and now having injectors replaced.