3 years ago when I installed the stove, I had a half tank of oil (275 gal tank) and burned a quarter tank in that time. I decided to purchase their minimum which is 150 gal, but luckily I was their last stop, so they gave me 118 gal. My tank is 3/4 full now, so I expect it to last us another 6 years. Pretty damm good, and its insurance if I get hurt or anything.
Thats good thinking, lets hope nobody gets hurt. I think the same way, my gas fired burner is my backup. I can't complain for fuel bills around $30/mo for hot water.
Have 1/4 tank of oil ... tank was topped of last October... I should get something just for back up in case I stay in the woods one day....