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As a rule, your propane tank will hold 80% of its designated capacity, therefore, a 500 gallon tank would hold 400 gallons.

However, the 80% rule is based on expansion and contraction due to temperature. Propane expands in warmer weather.

In cold temperatures you can fill to over 90% capacity (450+ gallons) but you should plan on using a portion of that propane before the weather turns warm or pressure could build as temperatures rise, thereby opening the pressure relief valve and releasing gaseous gold into the atmosphere! The hazard could be worse than the expense.

Note: Some tanks are rated in pounds vs gallons. A 100 pound tank would hold just under 25 gallons.

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15y ago

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