Well i decided i would go buy a pneumatic air gun and see how it would do. I had about 600 in my tank when i started messing with it tonight. I ran the gun several times for about 30 to 40 seconds to oil it. Then i loosened and tightened several bolts on my jeep. I played with it for about 15 min. When i went to turn it off, i had around 500 left. So it will where the Co2 down but not as fast as some say. I could easily complete a project on my jeep one on tank and have enough to fill my tires. It also only costs $10 to fill it back up. I am not sure how accurate the gauge on this thing is but it is going to make trail repairs and when i don't have access to air a whole lot easier. Jimmy you will be pleased with it ;D