Propane is a liquid and is sold by liquid measure (gallon) or by weight (pound). When buying by the gallon:
It is not legal in Maryland to charge a customer a flat rate set dollar amount to re-fill a propane tank. And, it is not legal to add a charge for the labor of filling the tank (except the first time a tank has ever been filled a “purge” fee may be charged).
“$16.99 for a 20 lb tank re-fill” is not a legal method of sale
“$4.00 per gallon for propane” is a legal method of sale as is “Propane, $5.00 per pound”
50 Harry S. Truman Parkway, Annapolis, MD 21401