And you can prove that your tire pressure gauge is 100% accurate, can't you?The receipt I got shows the details of what they did. "32 psi each tire checked". Well that was wrong they are supposed to have 33psi in each tire. So I went ahead checking the tire pressure after the dealer installed and supposingly adjusted the air pressure and each tire had less than 30 psi... clearly the dealer lies about their work on the receipt you get from the service. Anyways enough of that rant.