hurm... looks like different ppl hav different thoughts of each petrol...
well im driving a 1.3 m perodua myvi...

if mileage is the factor
Caltex > Esso > Shell > Petronas

if pick-up is the factor
Petronas> Shell > Esso > Caltex...

so here we can say the more milage the fuel can give the less pick-up it will provide... maybe its the theory that "heavy" fuel burn slowly..[less pick-up more milage]

so for now i stick to shell... its the best of both world...