I have a Hatsan Gladius bull pup and a FX Dreamliner, both .22.
I can usually get 5 magazines through the FX before I recharge the tank. I can’t even remember when I filled the tank last. Don’t shoot the Hatsan much since I got the FX, probably going to sell it.
A buddy of mine has a compressor and fills my tank but like I said, it has been a long time.
How you tune the rifle has a lot to do with how much air you go through. Maximum power does not equate to maximum accuracy.
Careful, air guns are a deep and sometimes expensive rabbit hole to go down, especially if you like tinkering.