I bought it as a last resort, the day I used it was today. Get 40 psi, I set it at 40, it stopped at 40, I'm happy with that. I think they are better for a car, maybe a 1/2 ton truck will take longer but it will work. If you have a truck that is 1/2 ton or bigger you better get a heavy duty truck which I can get for my 3500 for sure