I'm with saddlebag on this. There is no way that disconnecting your O2's (which adds fuel BTW) is going to give you better fuel economy. I unplugged mine and couldn't tell any difference in performance and I actually noticed a drop in fuel economy. But I'm pretty sure it just coincided with the fact that I was just finishing my break in period so I am alot more liberal with the throttle now.
To note though, when I installed my RPW pipes I had the O2's unplugged and I still got a ton of popping and backfiring. It took me getting a PCV and a dyno tune to fix that. Obviously other people have had different experiences.
2011 Cross Country
-Cee Baileys Windshield & Lowers. Victory Lower Bag Rails, Driver And Passenger Backrests.
-RPW Exhaust, Lloydz Air Filter, VM1 Cams, ATS (Timing Wheel), 1/4 turn throttle & IAV. PCV with Custom Tune by Coweta Customs.
105.2 HP & 127 Ft-Lbs on a Dynostar (Eddy Current) Dyno.