I am the proud new owner of a 2011 f350 screw lariat fx4. The truck already has 37,000 miles but that's nothing for a diesel. A little history on the truck, it had the NOx sensor problem when new but that's been fixed also when I went to pick it up the ebreak light wouldn't turn off as soon as I got in it, which was a good thing cause I found out the previous owner did the high idle mod too it already. Other than that it's been a problem/accident free truck. The hardest part was handing the keys of my 2010 f150 over that I purchased new for a used truck but the big diesel is starting to grow on me more and more. Only down side is the previous owner had a fifth wheel hitch in the back so there is holes in the box along with a few other holes that were drilled for reasons unknown. So far the trucks average fuel mileage has been around 14-15 and that's with half highway at 110km/h(68mph) which is a little lower than I expected but it's a high heavy truck with lots of power and I added some diesel kleen in hopes that will help.