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.
The bill indicated 70 gallons of propane was delivered at $3.17 per gallon and also indicated the initial tank fill percentage was 70% and the final fill percentage was 80%. I knew something was wrong because my tank holds only 220 gallons and 70 gallons would be a 30% fill-up.y tank was already 70% full. I have not been using my furnace for heating this winter, not once. I've relied on 2 space heaters, so I have essentially converted to 100% electric heat which is a lot cheaper than using the propane furnace that came with the house.