[my427cobra]

So I'm looking at the 7 gal aluminum air tank on sale at Harbor Frieght.

Wondering how many tires (say 255/70x15 on 7" rims) the tank will fill if the tank is at 125 psi and I want the tires at 25 psi.

Will it fill 4 empty (flat) tires?

Is there a rule of thumb/calculator/chart that can tell me this?

Or do I just do the math based on cylinder volumes and proportion the pressure?

Greg