"Steve Barker" wrote
why would you bring in one that wasn't empty?

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Steve Barker

Uh, you have one that is almost empty, and you want to cook something that
will take three hours ...............

You're going camping, and want to just take a full tank ..................

You don't want to make an extra trip, so you round the low ones up and have
them all filled ..........................

Then only charge you for what you put in them, so what's the difference
...................

Steve