?
"Steve B" wrote
How many people are thinking that they are getting 20lb (as they would if
they took their own tanks to a refilling station) for a good price but
getting only 15lb?

Perce

Only those who are in such a hurry that they don't read the sign.

Steve

After not having to read the sign for the past 50 years, it is a sleazy way
of raising the price. Yes, it may be legal, it may be show on the label,
but I don't read the sticker on a dozen eggs either. It has always been
that way.