Camping in Knoxville. Temps tomorrow in the 20's. I use a propane gauge and when it shows low, I remove the tank and weigh it with a fish scale. 30 lb tank weighs 23.3 pounds empty, according to the tank. One gal weighs about 7 lbs. Just put 6.2 gals in my tank today at $2.39 a gal at Tractor Supply. Can't hardly beat that price.
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