Ours is reaching that magic point where it finally gets to its peak mileage. On our 1999 and 2003 superduties that point was around 30k to 33k miles. This one has 28k. We average 11 to 13 mpg towing 14,360 lbs at 60-64 mph. The high end of that range is on flatland, no wind to speak of. In serious mountains it will drop to around 10.6. When the truck had around 7k miles it averaged a couple of mpg less than that and slowly got better.
Not towing, we now average 16-17 in town, 18-19 on the highway. That is over full tanks of fuel. Taking readings from the trip computer over short distances can seriously skew those numbers. When on winter diesel, subtract roughly 2 mpg from all numbers.
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