50 psi will get you a lot further than you think. You do not need to worry about you the psi in the tank until you see that the tank will no longer produce the pressure to desired CFM you set. Once you have used a few tanks you will know, roughly, how big a job you can do with what psi you have in the tank. I have two tanks. I ran out once, on a saturday, (the gauge was not working properly) and I will never do it again.