Higher maintenance costs. With all the emissions crap on diesels anymore, they aren't the engine they used to be. Ask anyone that had a 7.3L then traded for a 6.0L or 6.4L. Biggest mistake they made. They can't give a 6.0 away unless it's had thousands of dollars poured into it, 6.4 is a little better, but still has problems, 6.7 verdict is still out. A low mileage 7.3L will still sell around the $20K mark. I frequent a farming forum, you'd be surprised how many farmers are switching to the 6.2L gas in their F 250 and F 350's. Gas, tires and drive the wheels off of those they say. Most have well over 200,000 miles on them and that's all they've had to do to them plus maybe a set or two of brakes. They say they pull like a 7.3L did. They got fed up with EGR's, Def, and whatever else was always costing on the newer diesels.