The only other thing I observed now was.. My idle RPM (Yes, my vitz is double meter ) was at 1100 which is above than it usually is (700 - 800). It stayed there even after cool indicator went off. So I stepped a little and kept car at 2000 - 3000 rpm for half a minute, and let it go, than it went down to 900 - 1000.
Another thing that is happening is, when for example, I steer my steering to extreme left / right, rpm drops and I can clearly feel the difference in engine noise, similarly, when I open door & indicator flashes, I can feel the same difference when they turn on / off. I also have HID instead of fog lamps, so when I start them, rpm drops a lot (like 400 - 500).
What do you think all these issues are linked too? Generator? :s