AndrewPKYap,
I haven't tried Mobil, so I'm not too sure.. But I can tell you
that when i pump Shell V-Power, I can really feel the difference in
the car's response and it seems to give very very slight better
mileage too. But It is really TOOOO EXPENSIVE and i have no choice
but revert back to Shell 95, which i think is rather similar to
Shell 98 (my own personal opinion).
