The owners manual says that the car is designed to run on 87RON. The petrols companies in Pakistan claim that premium is 87RON so if you are getting fuel which isn't adulterated then there should be no knocking. In days gone past, when petrol was sold as super and regular, many pumps used to mix regular in super which resulted in lowering of actual octane rating. Now regular is no longer available and the way petrol pumps cheat us, is by tampering with the meters.
The only way you can test actual octane rating is by sopisticated lab testing, however, a crude method which is also used by inspection teams is specific gravity. The methof for conducting a specific gravity test is by adding ether to a test tube and then adding petrol to it. Ether being a hydrocarbon is mixable with petrol(water isnt) and then colour change if any is observed. The test is positive of colour changes to a reddish hue and indicates that the octane rating is lower than 85(or 84 dont exactly remember).
The reason i gave this account is not for you to carry a bottle of ether and test tubes with you, every time you go for a fill, but to inform you about the results of already conducted tests. Caltex has consistently had the best octane ratings(I am not aware of total's ratings) and shell has had the lowest. So, if you are filling up from shell(based on evidence at hand) you should add 1/3rd HOBC to make sure that you are getting adequate octane rating. HOBC will not harm your engine in any way but if the car is designed to run on a specific octane number it will not benefit from higher octane ratings. It will only use what it requires and wont burn the rest. Feeding apples to a donkey wont turn it into a horse.
Put some alloys to go with your cool red, red is a bold colour and wheel caps really sub due the impact of the colour.