About Retail Cooking Gas:
Liquefied Petroleum Gas (LPG) for household use was initially marketed by PETRONAS in 12kg cylinders whilst the 50kg cylinders were for industrial use. Dagangan’s survey indicated that on average a household would use 12kg of LPG per month for cooking purposes thus giving the 12kg cylinders a slight advantage in cash outlay as opposed to Shell’s 14kg cylinders….
Visit here and buy books so I have some spending money. I expect you to buy the whole set of 4.