On Feb 12, 8:34 pm, "Edwin Pawlowski" wrote:

As for checking, you do know the volume of the tank. You can figure about
how empty it should be based on how much the driver fills each time. Before
the next delivery, see if you can find the level before it is filled. With
a small grill tank, you can sometimes see the moisture on the tank
indicating the liquid level. You have to be using gas for that to occur. I
don't know how well that will work on a larger tank though.

Many tanks have a guage on them. Most show % of tank volume, but mine
shows actual gallons in the tank. Not real accurate, but a reasonably
fair indicator. There are also stick-on strips available that give a
rough estimate based on temp as Edwin stated.