Sharing what i have experienced. I drove atoz, myvi, wira, citra, accord, sonata, city and civic.
These petrol brand all giving me the same result. Other car might vary.
From top to down, the petrol brand give me the most engine knocking to the least. (during hard acceleration/uphill)
1. Caltex
2. BHP
3. Petronas
4. Shell
5. Petron

Petron
Pros
give me the best FC +10%~15% compared to other brand
more low end torque(smooth engine drive at low end)
Cons
Engine noisier and also warmer
No high end power above 3.5k rpm
(May be Petron more suitable for low rev engine)
Among all the brand, Petron allow me to advanced more of the ignition timing without giving much knocking thus able to give me even better FC but it will kill high end power.

Shell/Petronas
Pros
Cooler engine
More high end power(smooth engine drive at high end)
Cons
Lesser low end torque compared to petron

Usually driving in city i will use Petron and going outstation i will switch to Shell/Petronas.

This post has been edited by cent88: Oct 27 2019, 09:47 AM