Interesting thread for me.
Anyhow, some info to add
Propane weighs 4.2 lb to the gallon.
A properly filled 20lb tank will be right around 4.7 gallons, can be off just a bit due to temp.
Just about all cylinder exchanges in this area (amerigas and blue rhino) are the most common, have in fact gone to only filling with 15 lbs. it has nothing to do with transporting though, they do it because its a clean cut amount keeping them from being overfilled
Yes you can still overfill a tank with an opd valve.
Propane is 92,500 btu,s per gallon per hour. So your everyday average grill will run 3 to 4 hours per gallon. A 100 gallon tank breaks down to an average of 350 hours hooked to your grill. If you screw up and leave it on for 12 days, a costly error. Lol.
Transferring liquid propane at your home like that video shows is not a good idea, that 1lb cylinder can easily be overfilled like that, especially being ice cold to start. When it warms, the liq will expand causing the relief valve to pop off spilling flammable vapor into your home, when it finds an ignition source, then you get on the 6 oclock news.
Best practice for both safety and finance, find a local pump station that weighs it in and out charging around $3 to $4 per gallon.
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