Well, it's been over 500 miles since my PCM was reset from the CEL for the O2 sensor and it has NOT come back on.
Also, my Highway Fuel Mileage is NOW OVER 23!! Actually 23.2 MPG!!
This is on a 98 EX Eddie Bauer 4x2 with 4.0 SOHC, 4.10 gears and 255/70-16 Revos !! :thumbsup: :D