If your propane tank was at 40 percent when they filled it to 80 percent how many gallons did they put in your tank?

You would need some additional information, for example, the total size of your tank.

You would need some additional information, for example, the total size of your tank.

You would need some additional information, for example, the total size of your tank.

You would need some additional information, for example, the total size of your tank.