We had this stove installed on January 8th. Just tallied my usage to date. We have used 9.5 bags from Jan. 8th-Jan. 21st during that time. Not to shabby at all....and approx. a third of those days/nights were below 20. Last night was 0 outside...brrr. lol Have not run the furnace one bit except for hot water. I have ordered that middle finger paper cut out to paste on the oil tank filler pipe when I do need to order oil for hot water. lol lol kiddin. Feels very good though to heat my home for a very reasonable amount of dollars.