I just swapped out mine. Already have seen a slight improvement in milage but a noticable loss of power as the engine was running rich before. Im going to wait 2-3 tanks before I come to any conclusions though. A mechanic told me that the ECU would fully reset to the new O2 sensor after about 60 keystarts.....thoughts?
My freak-of-nature-3.0 just broke into 20-21mpg on this last trip home. Got 165 miles on 1/2 tank doing 70mph, I'll know exact numbers when I fill up again. (no racks, no big tires, 4.11 gear, 50psi, no gunning, no hills, the FL norm...)
Hope for 20, but as the previous poster stated, don't expect it. Most 3.0s seem to be lucky to get 17....
