Before the introduction of Primax, i used shell. Have been using primax eversince its introduction by petronas as it gives more milage and no knocking sounds as when i used shell

No, I was referring to the flow speed. So if what u say is correct, then the 'engines' are diff between the various brands then. Shell is the fastest from what I've experienced.

Driving 2008 Myvi and a 1975 Corolla.

On the old carburetor corolla, Petron does not cause any problems. But using Petronas or Shell does. The problem is not really about mileage. But rather the stronger cleaning agents inside Shell and Petronas. My corolla stalled 2 times in 2 years using either Shell or Petronas. Why did it stall? The fuel cleaned up rust form the fuel tank. This clogged up the fuel filter and fuel cannot get pumped to the carburetor.

On the Myvi however, it seems to give me a little bit more mileage. I was on Petron the last year and switched to Petronas few days ago again. But the mileage increase could probably be due to the service done to the throttle body back then. So no clear results here then. 😁

I use petronas because got 8% rebate when using maybank petronas card. Every month I get back over rm30. Fuel consumption wise dunno because I never use other brand for my ertiga. With petronas I get at least 500km per full tank.

Problem is only on Fri and Sat.

No issues for me because I always refill on Sat & Sun, that's the rebate days for my card.

Previously using Shell, switched to Petronas and now Petron.
In terms of mileage, Petron > Shell > Petronas. Not sure why, similar driving conditions though.
I'm now alternating between Shell and Petron. Usually will go for Petron, unless I'm too lazy to pay at counter or there are no Petron stations on my route, then will pump Shell with RFID instead.

This post has been edited by maprocks: Mar 28 2022, 10:05 PM