RON95, Petronas Primax 95

I run 95 majority of the time.

Friend of mine on a City says his RON97 and RON100 gets better mileage, something like 14kpl vs 12kpl on RON95. Same route, same traffic conditions everyday to and fro workplace.

But, after calculating. The costs is actually negligible.

Unless there is pre-donation / engine knocking. It doesn't quite optimize itself running on 97.

Would you traded your jazz to this ???

What about this? Hahaha....  

Is it screeching sound from the disc brake when you press the brake pedal?
It will go away once the rust on your disc had been grounded off after a few brakings.

I am having this problem also especially I park my car at the condo basement car park.
The wet and cold environment and never get direct sunlight will make my brake screeching every morning. Kind of embarrassing.
Once I drove out of my condo, the sound will be gone.