Propane tank is limited to 80% of capacity. (head space) and has a shutoff valve to prevent going above that. The gauge on the tank will show about the 3/4 mark when "full". 80% of 13 gallons is 10.4 gallons. If you use 3+ gallons you will be at 1/2 tank indicated. Propane expands with temperature change and the head space is needed to allow for expansion, it also reduces the accuracy of the gauge.
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Hooligan, Pensacola, Fl -U.S. Coast Guard 1956-1985
2016 Thor Siesta Sprinter 24ST diesel -1972 Moto Guzzi
2008 Suzuki Grand Vitara TOAD
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