[Ryland]

the air drills that I have used seem like they would run for less then a minute off a tank that size if you had it up o 120psi to start with, then at least my air compresser draws 550 watts to start out with and as pressure climes th watt draw climes, with a tank pressure of 40psi it's drawing 780 watts, 50psi 850 watts, 80psi 900 watts, 100psi 950 watts, after 6 minutes it has drawn .06kwh or 60 watt hours to bring a 28" long 12" across air compressor tank to 110psi, that is around 1.8 cubic feet of air that I put 60 watt hours of energy in to, then I hooked my air wrench to a generator and hooked meters up to it, about 20 seconds and 4 watt hours of electricity later and my air tank was empty, that same energy going in to the battery in my electric car would take it nearly a quarter mile, or my electric bike about half a mile, that air powered bike claims 4mph for one minute or about 350 feet on a fill.