first of all, the mileage depends on how u drive and ur car condition and engine cc i think. which one more power? i think mostly the same.
from what i heard :
1) malaysia petroleum that been dig out contain no suplhur, but we export them to other country
2) we import fuels from middle east, and they all store at 1 port, and esso, mobil, shell or even petronas..they all the same origin.
3) i never heard such a stupid commercials like this
"our petrol are fresh and can bla bla bla"
huhu u get the petrol from the fossils, i wonder how it can be fresh? + we import it from middle east, after they dig it, they process and bla bla bla, then will send by ship, also take about months, hahah i wonder how they can be fresh?