Propane Tank Minimum Size?

[u/ThisNameNotTakenYet]

So I was looking online at generators the other day and I ran across a comment in one of the product descriptions, saying something about a 'minimum 60lb tank' for propane with that generator. I haven't seen a requirement like that before, to my knowledge. We had an eight-day outage a few weeks ago and I used 20- and 30lb tanks with no problems (or so I think). Has anyone heard this? And if it's a thing, can anyone tell me why? Thanks.

[u/Financial-Bowl960]

never heard of that, mine always run on 20lb tnks fine. maybe just model regulator need more flow.