Mileage is no worry if maintained, as stated above... we just bought an Excursion a few months ago with 243K miles on it, and it's running fine, I went over it closely before I bought it. Even think it's the original trans... the auto trans in these trucks is the weak link, and with that kind of miles, I'd guess it's been replaced, if not, start a savings account for a trans rebuild, I've had my yellow truck done locally for $1500, but others like BTS rebuilds are far stronger, but will cost you around $4000.
Mileage? I've got 220K on the yellow dually, 192K on the red supercab, and we're at 245K on the Ex now... and they all get 12-14 MPG most of the time, I can get up to 16 mpg out of the red truck on the open highway.
Another note... the guy I got the red truck off of about a year ago, he replaced it with a 250K mile truck, up to about 265K on it now, and he's pleased as punch... he wanted a long bed and an auto trans, and got an XLT, 4x4 ext cab, high mileage, rusty truck, for just under $5k.
Last edited by dieselcrawler; 10-27-2011 at 04:37 AM.