greybeard
Herd Master
The last time they filled (12/28) I had looked at the gauge a few days earlier and it was about 30%. Paid over $1K for the "fill" and yes I think you are right, they only seemed to have gone to 80%. Not sure why they don't go higher
From a propane company FAQ:
Q: I just had a propane delivery, but my propane tank isn't 100% full. How come?
A: Liquid propane expands quite a bit as the temperature rises.*In order to accommodate for this volume expansion, propane tanks aren't filled above 80% capacity. It's standard industry practice and important in order to maintain a safety margin.
(I don't really know much about propane tanks except that even at 80% they still float. I had one show up in my pasture in Sept 2017...the owner finally showed up to haul it home about 3 months ago and when he flipped the dome lid open red wasps about ate him up)