When we installed our generator I bought a 320 gallon tank.
It was $1k to buy, but I get the discounted rate on LPG, about $1.00 less than those who rent. I figured that after a few seasons it would have paid for itself, which it probably has in savings. These larger generators can use from 1.5 to 2.5 gal per hour. Figure in a week without power a few times and you will kill a few tanks. When we had the big ice storm a few years ago we were displaced for a week. Hotel rooms, struggling to keep the pipes intact, eating out, and the overall nuisance made it all make sense.
If you are in it for the long haul, buy your own tank and shop your propane like others do with oil.
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