As long as there is liquid gas in the tank the pressure will stay at the 8-900 lb reading. Once the liquid is gone the pressure will drop at a rate proportional to your use. I have 2 20 Lb tanks, one runs 3 tanks and the other runs 1. I have 3-4 days on the single tank tank, and the one that runs 3 tanks is less than 1 day.
The best way to gauge your tank is to weigh it empty then refill, then you can weigh it to see how much is in it. That only works if you refill instead of swapping tanks, altho you could establish a rough empty weight for aluminum and steel tanks and they shouldn't vary to much.
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