I think that propane usage estimate is too high. We have been drycamping for about 10 days, and in that time used about 1/2 of a 10 gallon tank. (Our dial level gauge on the tank is accurate.) That covers the fridge, a little cooking, 20 minutes of heating 6 gallons of hot water in the morning, keeping the furnace at 66 at night, and a 20-30 minute blast in the morning up to 72 or so. Now last night was colder, and it must have run quite a bit more than normal, because the tank level dropped more than I expected. Just running a fridge, it would go a long time.