Using a map switch wont do any good for you all wanting "eco" mode for street commuters. If you want to lean it back up in closed loop range the O2 emulator would have to be removed out of line. The closed loop range is quite large. Roughly speaking 0-60% tps, up to 7250 rpm. So anyone riding in that range is in closed loop. My maps there do noting virtually. That is the DJ O2 emulator richening it up about a full AFR point. A map switch is easily done with the pcv Just open or closed like Treachery said. I suspect the fuel economy will suffer with the O2 emulator and my map out of PCV, so will drivabilty etc.