This unit is good to have for your cars, motorcycles and anything else you might need it for. I would suggest checking what the actual air amount is with a trusted air unit because mine has a tendency to stop automatically a pound higher than dialed in. In itself, one pound may not make a difference in a car tire but it might on a wagon tire or something that is rated for low poundage. Overall, I recommend it. I bought three, one in each car and one for the motorcycle.