Join Date: Oct 2006
Location: Leesburg Virginia
I've heard that once the high side needle moves, you only have gas, its no longer compressed into liquid. If that's the case, there's very little CO2 left, cost wise. Anyway, I've found that once it goes below 500 psi, I have a few days to refill so, that's when I plan for the refill. For me its not worth it to worry about wasting a few cents worth of gas since I have to go for a refill during business hours. I do have a Victor dual stage that the working pressure never varies.