Restricting the movement of a broken bone in your leg is critical to proper healing. To do this, you may need a splint or a cast. And you may need to use crutches or a cane to keep weight off the affected leg for six to eight weeks or longer.
(Minimums vary by location and tank size, and can range from 100-1,500 gallons.) More often, the propane company charges a fee of anywhere from $25-$250 a year but averaging around $75-$130 annually, depending on local rates, the size of the tank and whether it's aboveground or underground.
Keep in mind however, that for your safety and by law, tanks cannot be filled above their 80% capacity. I'm only familiar with prices in our part of the country, but prices range from $12 to $18 to fill a 20# cylinder, which is about 4.7 gallons of gas. Some tank exchange services only put about 18# of LP in the tank. P.S. Tare weight (empty weight) is listed as T.W. on the 20# cylinder and can range from about 16 lbs. to over 19 lbs., so it is smart to pay attention to both the listed empty weight and the full weight after the tank is filled.