Yeh as Gee Tee said, check all those fields before you change tanksIt's worth checking the gun internals, hose fittings and bottle reg for any small leaks. The 3K 0.8L won't give much capacity, especially on a spool valve marker so a leak could rob you of shots. Other than that make sure the gun is set up 100% to maximise efficiency - dwell, LPR etc. and matching barrel to paint willl also boost shot count. Oversize bores waste air.