I've had my '02 EB 4.0L/auto for about three months. It has about 150,x.. miles on the clock. The day after I bought it, I snow-birded to the west coast (700 mi)
It did 19.7 MPG. (avg speed 75 MPH w/cruise) I have since changed all fluids (t-case, trans, 2 differentials) and stuck a set of new plugs in and still getting about 13 around town and a steady 19+ on the road. I was hoping for better, but it's a strong runner. I'll change the O2 sensors next week, but it looks like it will be a 19 MPG truck.
Art