Oxygen Sensor Narrow Band Test2, with Air/Fuel Ratio Meter

In this Narrow Band Oxygen sensor test, I add an inexpensive A/F ratio meter and control propane flow to it to get the meter to read in the center of its range. I will be using this setup with woodgas, running a generator set, not in a vehicle. So there will be no ECU in the system. These oxygen sensors are optimized for Gasoline. Propane appears to work somewhat differently. I assume woodgas will be different from gasoline, too. This narrow band sensor is actually at its worst, from a rate of voltage change standpoint, right around the 14.7:1 area. If woodgas works best at some other ratio, then the sensor output voltage will actually be in a more linear range, won't it?