Our LPG tank ran out this morning so we had to get a new one. The 11 kilogram tank cost us 645 PHP which is about $13.28 USD. The previous tank lasted for right at 3 months.
It averages out to somewhere around $5 USD per month on our gas bill for cooking.
Obviously, the price of LPG fluctuates with the market. The ladies said that for the past two months, the 11 kilogram tank was going for 725 PHP, which is about $14.93 USD.