What do you mean you "owned" where did it go?
About Knocking.. even on Pakistani petrol its not as bad as people are writing. May be they take the car to their village where it starts knocking, in normal roads, it doesn't happen with me.
The "SIMPLEST" Solution is to put 500 rupees of Hi-Octane, that's it. For me it completely eliminates knocking.
Even if you fill the whole take up with high octane, its not that expensive. Where you put 2000 rupees of Petrol, you will put 2300 rupees of it? And with hi-octane you will get much better mileage so the extra money you spend will be compensated.