How much can you save anyway...
I used to fill up too b4 price increase, but when come back and calculate, for every 15L you lose 1L, and normally when we pump RM50, its about 35.21L... you lose less than 3L of petrol only. Its not like you can buy 1000L and store up for couple of months. Now I think that its a waste of time unless you car can fill up 100L, then might see the difference.