I have an cammed g8 and have just started trying to use a wb. When I start the car, and it is warmed up, I am getting readings between low 13 to almost 16. I am wondering if this is normal? I assumed it would be very close to 14.7. I did not get a chance to drive around as it was snowing. My other question is regarding o2 sensors. I have just hit 36k miles. I am wondering if maybe my stock o2's could be wearing out and not doing their job. Do these wear out over time, or do they just work/fail and there is no in between? Thanks for any input, and dealing with a new tuner.