Finally replaced my front O2 sensor after almost 197k miles. I don't think it changed anything
 

Here's a little O2 sensor voltage comparison of 3rd gear pulls.

196k old OEM sensor
4/7/07 40-45F
Idle Part Ld
-0.8% -7.0%
O2 Sens
Bef TWC RPM
0.83 4800
0.825 5000
0.82 5200
0.815 5440
0.8 5640
0.79 5840
0.785 6000
0.785 6160
0.775 6320

New Bosch universal sensor
4/8/07 43F
Idle Part Ld
-0.8% -1.6%
0.845 4840
0.84 5080
0.82 5280
0.82 5480
0.81 5680
0.805 5880
0.79 6040
0.785 6240
0.785 6360

I only put 11 miles on the sensor, so I don't know if the drop in LTFT is because it hasn't been driven enough. It looks a little on the lean side. Seems odd that it would pull fuel. I have to find out if the sensor voltage is expected from the GIAC software. The next time I log anything, I plan to be running PC16... maybe I should put it off another week.

OT...but, just got home today from a week in your state... burrrrr. that is all

confusion? Oh, you mean NJ. Yeah, it's cooler than normal for this time of year

Clear codes to wipe the LTFT, and then see how she runs.

I did that after installing the new sensor and before I started it for the first time

Let a tank of gas run through it, and evaluate on the second tank.

I sent out my ECU this morning to get flashed w/ PC16. Next trim readings will be with that

Never make two changes at once.
 

Course, a new O2 is probably a benign change...but if the goal was to see if it made any difference...you'll never know.

I know. Since the sensor voltages weren't really different, I wasn't concerned
 

I really only installed the sensor because I'll be getting PC16 and that's what's recommended.