previously i made some comparison. few different types of cars, and then me driving them.

personally i found Caltex Techron, BHP, and Petron to be the best in mileage. Performance wise? all similar.

I try to stay away from Petronas. Dont know why, for the same amount of money, seems like mileage is the least compared to others.

So after a while, because not that easy to find Caltex, i used BHP/Petron regularly.
Then after moving to a different location, i only fill up with Petron as they are more accessible.

So, in terms of mileage, with a few cars ( honda, proton, bmw, kia ) and my onw personal way of driving, these are my choices:

1) Petron
2) Shell
3) BHP
4) Caltex
5) Petronas

Maybe Petronas finish faster? or issit due to my driving style? or maybe petronas stations, when u fill in RM50, you get lesser volume?
Meaning, u supposed to get 24.39 liters when u fill rm50.

yes, the meters show 24.39 liters, but in actual maybe:
Petron gives you 24.43 liters (example only)
Petronas gives you 24.39 or maybe 24.35 (example only).

thats why feel like more mileage with petron?

I try to stay away from Petronas. Dont know why, for the same amount of money, seems like mileage is the least compared to others.