"Jessica" wrote in message

There is no reason why propane sales should need to charge a full tank for
a 1/4 tank fill, if propane dealers weren't out to gouge and cheat their
customers. We aren't talking bulk sales here, and charging by the unit
sold certainly adequately includes labor costs for other fuel sales.

The article cited already establishes the propane industry's (lack of)
integrity and business ethics by providing less product without informing
their customers. It's not surprising they freely engage in less than
above-board practices.

They do it because they can. It has been an accepted policy for many years.

Propane dealers are some of the worst on the planet. They have widely
varying rates depending on use, they won't fill the tanks of another
company, they rent tanks for years, they make if difficult to let you buy a
tank, and on and on.