Well, we really don't need to, but it's nice to have around in case a family emergency requires us to be away from home a bit in the winter. When we bought this place 6 years ago, we bought a tank-full of #2 heating oil. I have supplanted that with 911 fuel-stabilizer a couple of times, and finally we are getting to the bottom of that tank. I ordered 100 gallons of oil today, and the woman at the fuel-supplier was asking some questions about usage. It's hard to explain to somebody in that business that you use very little oil, and a single tank of oil has already lasted 6 years... My youngest uncle is an HVAC guy, and he has encouraged me to run down the old oil and try to keep a minimal supply of fresh oil in the tank.