I used Octane booster of LM and heard bit of knocking in the engine. Mine is passo and I didn't feel any significant effect with it.
I also used injector cleaner, but felt no charm. Can hear bit of knocking specially when it shifts from 2nd to 3rd gear (automatically).
I feel found a good petrol pump (already mentioned in separate thread) and feeling car so cool & smooth as silk WITHOUT THESE ADDITIVES.
It doesn't work well for me.
As far as the procedure to use it already mentioned over the bottle. Its 150ml liquid already sufficient for 70L petrol.
So first, fill the tank (go for auto fill. Not for manual fill). After that pour half Octane booster in the Petrol tank.
Save other half for next time.
And for the safer side, never buy this product again (Octane booster or injector cleaner, etc.) Because these additives doesn't produce any significant charm in driving and just easily pull money out from our pockets.