You can tell it deactivates 3 cylinders when the instantaneous gas mileage indicator jumps up. With all 6 cylinders running, it won't go much above 30mpg, but with deactivation, it goes up to 45mpg under a little power. You can also feel very slight engine vibration under a little power.I always have mine in Sport anyway. Is there any indication on the dash when VCM is working. I saw a video where the ECON indicated on the dash. Is that the VCM working on that car at that time?
And can you help me with where in the manual does it talk about disabling that VCM.