We’ve made it 4 nights already on just one standard propane tank. Each night the weather has been at or just below freezing and we’ve stayed so comfy in our little travel trailer with the furnace. (It’s mid 60’s during the day so we’re only using it at night). This summer we learned how long we could boondock in regards to water and electricity. But now we’re getting an idea of the furnace propane usage. (Obviously actual temperatures will affect it and will be different each trip.) Tonight will be night 5. It’s only supposed to get down to 40 so I was willing to risk it to see how far we can stretch our propane, especially since there isn’t a propane refill station nearby us currently. Love learning what our little trailer can do. And I love that we are able to be much more flexible in when we can go camping.