Thanks for the info.
What I generally do is by going on what I've heard & been told is; fill it up to 190Bar, fire between 40 -45 shots then refill.
I got my 12 lt bottle filled earlier today, so now I can use this as a base & compare. Which means I should get about 1800 shots
, not bad when it cost me £2.75 to fill the bottle.
Regards
Paddy.