I am using Petron unleaded. I have been a Shell user for so many years but I had a problem with my Shell Citibank card which I cancelled. I now have a Petron BPI card so I had to make the switch.

I don't understand why Petron has 2 types of unleaded? I think it is 91 and 93 Octane. I chose the 93 octane because I think the unleaded of Shell is 93 octane? Does higher Octane mean better fuel?

My FC has improved recently. It was steady at 9.7 km/l for the past few months then recently went up to 9.8 km/l then yesterday it was 9.9 km/l! I am not sure if it has to do with Petron's fuel. I have the same driving condition and destination (no traffic and office only).