Christian Missions in Persia. Christianity was introduced in Persia in the Parthian period, and several bishoprics were established there (Latourette, II, pp. 263ff.).
You will likely pay more for the exchange, even if your tank is completely empty. An empty 20 lb tank will hold about 4.7 gallons of propane. That is $18.47 at $3.93 per gallon, which is the low quantity price (I just paid $3.44 per gallon when filling several tanks). The exchange is about the same price. Keep in mind this comparison is as if the exchange gives you a FULL tank.
On the basis of the US Energy Information Agencyâs weekly average propane prices during the 2011-2012 heating season (October to March) it cost between $1,100 and $1,150 to fill a 500-gallon propane tank but tanks typically store 120, 250, 500 or 1,000 gallons of propane so the easiest way to determine how much it will cost to fill your current or ...