I guess the Tech Rep at Crosman needs more coffee. he emailed me back and stated it took much searching but, the disco holds 30 cc. I'm not even going to call back and ask again.
I used 133cc on airhogs calculator and found my 3300 psi 80cu tank will fill my disco like 89 times...if I refill at 1000 psi and fill to 2100 psi. ( I am assuming the bottom of the green area on the guage is approx 1000 psi?)
Sorry I couldn't help