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From the “For What It’s Worth” Department… I came up with this geeky but handy formula for determining how many hours of burning/cooking time you have left on your propane tank (assuming of course you know what your tank weighs empty and you know the BTU rating of your heating element).

( ( ( Current Weight – Empty Weight ) / 4.23 ) * 91500 ) / BTU Rating

You can try it out on my Google Drive Spreadsheet Calculator if you like.