I totaled out my pickup last summer and I was looking to replace it. Anything at all had over a 100,000 on it and thay wanted anywhere from 12 to 25,000 for them. I picked up a 99 powerstroke for a very good price. It has 250,000 on it but it was well maintained. I had to replace the glow plugs and the diesel shop said that the motor was in very good shape. I am like you and don't put a lot of miles on a year,and fuel is higher then gas but I get a 1/3 better mileage with it then the gas engine. If you can find a 7.3 power stroke with a lot of miles and was well taken care of don't be scared of it. By the way after the price of the truck and putting in 8 new glow plugs I still had less then book price in it. I was lucky I knew the truck and the owner, and his maintenance. Everyone was scared of the miles and he had it for sale for over a year.