Since some older model guys chimed in I may as well too.I bought my '08 used-26k-still had the warranty left on it.BUT as soon as that was history so was the DPF and EGR.Nothing worse than making an engine eat its own waste
In conjunction with that you have to go with a computer programmer with the end result being the power and torque you should of had to begin with
Anyway you are looking at '10 and up.They still use the DPF and EGR but as time went on I believe Dodge/Cummins worked more of the bugs out of it.I want to say late '07-early '08 was the transition from the 5.9 to the 6.7 the beta model if you will.I have had to replace the water pump at 45k
but it was still under the powertrain warranty.I've never hand calculated,but overhead console says (usually-when I keep my foot out of it
)20-21 Hwy. 12-13 towing my Crusader 320.Engine is not an issue with this truck.Keep an eye on things like the dreaded Mopar transmission,and front end components like balljoints and the track bar.My programmer comes with three settings.Mild Wild and Extreme.Have never set it on anything other than Mild.That seems good enough for me.Hope this helps.