Less than 100 psi in my 6 gallon tank with the compressor off and I was able to raise a car to top height of jack and lower twice and then half way back up before tank ran out of air. Car used for this test was a fairly new Camaro and just raised the front end which did get both front tires off ground at same time. Also it's low profile will work for most cars with body kits or lowering kits installed. Less than 3 to 5 secs both times to reach top height, so use caution when operating valves to control speed to raise and lower. I opened valves to max just for testing to see what jack was capable of.