At the time of the persecution of Christians in Rome many sought refuge in Iran and were given protection by the Iranian rulers. Though thousands of Persians embraced Christianity, Persia remained Zoroastrian with many adhering to the Cult of Mithra.
The average cost to refill a propane tank will depending upon the size of the tank, the geographical location, and the company doing the job. On average, a 10 pound tank is going to cost anywhere from $12 to $22 per tank. A 20-pound tank can cost upwards of $29 to $40 per tank to refill. A 100-pound tank can cost upwards of $65 to as much as $80 per tank. This is much cheaper per pound and will last a lot longer. Keep in mind that most stores will have a limit on the amount of propane that they can refill at any given time.
About propane tanks. The standard BBQ tank is generally referred to as a 20 lb tank as that is the amount of propane that it will safely hold. Some might hold slightly less than this as the OPD valve varies in size, but it is well over 19 lbs. The tank is NOT filled all the way to the top with liquid.