@fastian04 I have a shell fuel card (company provided so changing the company is OOQ) and I would use only F7, F10 or FC plaza in Peshawar that are expected to not mixing anything, and using V power only, not even mixing.
Tell me more about the knocking control valve, and recommend any mechanic whom you believe would look at the issue without acting defensive about it and blaming only fuel quality. Also in your experience how much could this be because of spark plugs, I just completed 10k and the issue still remains there at 60km to 80km acceleration.
Again the clicks/knocking does not happen all the time, its rare but spending the amount I did on the vehicle it should not be acting this way at all.