I have about 7400 miles on mine, bought last October. Had my first oil change at about 6500 miles according to the computer. Had to fill the DEF tank at about 6000 miles. No issues so far with the cold, truck was parked at work outside when it was about negative ten for about five hours and started with no issue, and that was with #2 diesel. Have it parked in a heated garage at night so don't have to worry about the cold nights. Have no issue averaging over 20 mpg this winter with only in town driving. That is with my larger duratracs. Currently averaging 21.4 this tank of around town driving but has been nicer this past week. Still enjoying the diesel power as this is my first, great engine/tranny combo. Have towed a little in town, probably around 8000 lbs with no issue. You definitely see the advantages of this truck with longer trips, whether just in town or out, don't think I would choose this truck if my daily trip is 5 miles to work, then sit all day, then go home, I think I would get the gas then. Sent from my Pixel 2 using Tapatalk