Funny you should ask. When I put the PC on, I left the Barbarian Mod (BM from here on) in effect. The bike ran great, but gas mileage went to hell. So I reset the O2 settings back to stock. I thought I felt the throttle response off idle get worse again, but wasn't sure.
A couple of weeks later, I ventured off on a 3400 mile trip to the Smokeys - yes, we did the dragon. After several days of riding - what I can only refer to in public as "very spirited" riding in the Mountains, I decided to re-do the BM while at a hotel one morning. The throttle response off idle got much better again. Also, I saw no gas mileage difference with or without the BM.
So, my answer is to install the PC and keep the BM going! :blink: