As good as it can be. I'm guessing a 7.3 non turbo, right? In late 94 they introduced the 7.3 TDI Powerstroke. They also offered a turbo and non turbo version. If the 93 you are looking at was built in late 93 it could have the ATS turbo on it. To give you an idea of mileage, my 94 PSD got better mileage with a 6500 load behind it than a friends crew cab turbo 7.3 got unloaded. Both 5 speeds, mine is an extended cab 4x4, his a 2wd single rear wheel. With the non-turbo 7.3 you can expect less. Personally, unless you are getting a really good deal, I'd hold off for one a year later.