I have an 02 Excursion with the 7.3. Bought it with 140k miles and it now has 245k on it. There is a Cam Position Sensor that, while it doesn't happen often, goes out and will sideline you. As in, will not start and there's no work around. Truck just dies. Good news is, the sensor is not that expensive, nor is it hard to install on the side of the road. Many people carry a spare sensor and the tools to change it with. You can be back on the road inside of 15 minutes. The other very common problem with these trucks is the stock airbox. They have a nasty habit of developing cracks under the filter so that the turbo can suck in unfiltered air. That's bad. Generally the fix is to remove the whole airbox and install a Napa 6637 air filter. It's a giant paper filter that replaces the whole airbox. Kinda like those ricer kids with their cold air intakes, but the 6637 is physically bigger than a whole honda engine. (not really, but almost) After that, just drive the damn thing. I know a guy that runs a limo service that has just shy of a million miles on a stretch excursion. He probably has a million hours of idling time on it too since they never shut off the engine when they are on a job. He hasn't done anything inside this motor, ever. It does have a lot of blowby and needs a rebuild, but he's waiting until it rolls the odometer to see if ford will give him anything for it! To get max economy out of it keep the RPM under 2000. On my 2wd Excursion I am doing 68 mph at just a tick under 2000 rpm. I'll get about 17 mpg there. If I drop it down to 65 mph I can get around 18.5 to 19 mpg. I think the pickups do a little better than my Ex. I've got over 8000 pounds to haul around when fully fueled with my junk in the back.