I have a 500 gallon propane tank that I own. I have propane central heat, gas range, gas hot water, and gas dryer. Although my Jotul Oslo puts a nice big dent in my propane usage, our house is too big for it and I still burn propane at the rate of just over 300 gal/year. Right now I'm at about at 28% left in my tank, and I want to know how far I can let it go before I really need to fill it up. I spent a few minutes calling around to propane suppliers in my area, since last year when I filled up with my usual supplier I suspected they were not the best deal in town any more. They were bought out by a large outfit just over a year ago. It turns out my suspicion was right, they were one of the highest priced of the suppliers I called. The bummer is the lower priced suppliers are not taking new customers right now, probably because they're the lowest priced and are getting swarmed. Unfortunately I have myself on the worst possible fill cycle, since I always need to get filled up in the February-March time frame each year. I'd like to get that adjusted to a late summer fill cycle, when hopefully prices are at their cheapest each year. It will probably be another 2-3 weeks until I am at 20% on the meter. How low is too low? I know this has been discussed before, but it seems that the companies got caught filling up their tanks before the big drop, and it is taking forever to bring the consumer price back down. The following site is one I've watched for a few years now, and they're pretty accurate. They have the wholesale propane price at $0.90/gal right now, yet the average consumer price is $2.39/gal! http://tonto.eia.doe.gov/oog/info/hopu/hopu.asp For reference, my normal supplier is at $2.39/gal, and the best I've found is $2.15 from somebody who will take a new customer. Just up the road a bit (but outside fo my delivery area) is a company getting $1.99/gal cash price. Another one local to me not taking new customers is at $1.87/gal. My only other thought is to get about a 100 gallons dumped to tide me over and then do the big fill right before winter starts. I'll have to see what the companies say about only dropping 100 gallons.