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You're good with the tank - both dimensions and tank stamp verify that. You have a 17.9 gallon tank when filled with water or a 14.3 gallon tank when filled with propane. Your math is correct.
A half tank fill-up should have been 7.1 gallons but it only took 4.3 - a 40% difference. I usually see 20-25% difference. It is just the error induced by the mechanics of the float and magnetic sender gauge.
Do what 16ACE27 suggests and dial your system in. I keep a log of tank gauge reading and pounds to fill. I know now that if I'm running the stove and fridge that when the 1/3 idiot light turns off it is time to refill. If I'm running the furnace I watch the tank gauge and when is gets to 1/4 I refill.
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