I've been spoiled with my Lexus LS460L - it has tire pressure sensors which tell you what the pressure is on each tire. The Tesla S doesn't do that. So do you rely on getting a warning signal (I never have gotten one) that a tire is low before you check the pressure, or do you actually measure the tire pressure at some regular interval (like when you fill up at the gas station . So far the only time when my tire pressure has been adjusted has been at the Tesla Service Center. What do you do? Thanks.