You're treating your Diesel wrong. It needs to be warmed up, and worked, especially now during break in. Even though Cummins was the one who wrote the book on using Diesel for Transportation, he didn't mean short in-town grocery-gitter trips! The Cummins engine is rated in hours of duty - typical is 10K hours or about 350K miles. Also, quit idling so much - it isn't good for the injectors.
When I bought my used diesel, I extracted the number of hours the engine had operated (info available from ECU) and after dividing it into the miles on the ODO, I knew I had a truck that spent most of its time cruising back highways. Trucks that have a low average of miles/hour (<25 is real bad) are the ones to avoid (lots of idle time).
Cummins offers a break-in service where they'll run the engine on a dyno for the purpose of seating the rings for those who aren't loading their trucks. I cannot say that this is the experience one will expect from this newer engine, but it is certainly a consideration for their ISB engines (RAM 5.9/6.7L). If I had a brand new XD, I would do some research, and see if I can do things that will help extend the life of the engine. Your owner's manual ought to have some break in tips. One of the best things one can do for their diesel is to hook up a wide and heavy load and hit the passes.
Don't idle so much. Idling saves start cycles, but really, how's only a few more going to make much difference especially under warranty?
