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The weekly (1/23/12) average national cost of Residential Heating Oil was $3.938 per gallon. To fill a 175 gallon tank the fill up cost would be $594.65 or an annual cost of approximately $2,378.60 (4 fills per year). The weekly (1/23/12) average national cost of Residential Propane was $2.863 per gallon. To fill a 250 gallon tank the fill up cost would be 715.75 or an annual cost of approximately $2863.00 (4 fills per year).
This means that filling a 500-gallon propane tank, which is what households that use propane as their main source of energy usually require, costs $948 (80% of 500 gallons or 400 gallons), a 7.5% increase on the 2012â2013 winter season average US price.ropane is generally stored and transported in steel cylinders as a liquid with a vapor space above the liquid. The vapor pressure in the cylinder is a function of temperature. When gaseous propane is drawn at a high rate, the latent heat of vaporisation required to create the gas will cause the bottle to cool.