If you have a tank you can pretty much play an entire weekend (when sniping) when it’s a 50ci or larger. Especially when it’s a carbon fiber 4500. I run a carbon 68 4500. Lasts forever lol. In terms of efficiency, psi settings and output. It depends on the following;
Ebolt or boltm?
If ebolt, air saver kit?
Inner barrel length
Field sniper limit
Regulator and psi
Other things I’m forgetting
So many variables. All of that taken into consideration, based on an average “500fps w/.20” limit; I’d say your reg will be at 140-180 depending on inner barrel length. I always run .48s as long as my rifle passes chrono and I’m shooting 300+ fps with a .48.
There is so much involved when you say “what psi do you run?” It’s not as simple as setting your reg to someone else’s. Also, with shorter inner barrels and typical sniper limits around me, you’ll probably need a Storm high pressure reg or a polarstar micro with high psi spring to achieve good output.