I wouldn't know either Yak, but it seems to me it doesn't realy matter. You won't hurt anything, the equipment or the bikes, if it goes below 6 cfms. If you run it at 125 psi and you feel it's working for you that's good enough. Knowing the number would't change the outcome. If you feel you need a much higher production rate then it might be time to step up to maybe at least a 100 cfm output and a blast pot to handle it. You could move up to about a 1/4 inch nozle and you would be amazed at the difference. Time is money.