how much cost tank for gas

As of today I'm spending US$10 for four, 16.4 oz (nominal 1 pound) bottles at Sam's Club. With both burners on high, burn time will average about 45 minutes at sea level, about 30 minutes at 5000 feet. It is best used with a 20 lb or larger gas cylinder and regulator for economy and unlimited cooking sessions.

Here's some more information:

http://www.brunton.com/product.php?id=400
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