With just the top hat mod (vinyl tubing), i got enough of an efficiency increase to make me happy. Fill to 3k, then used 3 pods and a hopper in a game and didn't experience any shoot-down. My tank was down to 1k afterward, though. But at least i know i can go that long off one fill.
Forgot to fill it for the next game but only went through a hopper & a pod and wasn't shooting strings. Didn't run out of air, though. I'm sure i would've experienced drop-off if i tried.