As of last night, the most expensive thing about running our 2012 Model S P85 has become wheel replacement! After rain and flash floods in San Diego, we hit a ginormous pothole, and it took out the fourth wheel in four years. The pothole was on a downhill on-ramp, and it was full of water. I was being careful and observant, and still didn't see it at all... just heard the thump, then the warning about no tire pressure. Then as I slowed around the curve... That picture was taken after we parked. There are 10 cars there with damaged wheels (we're the second one from camera). Honestly I don't think the 19" wheels would have survived either. Here's the actual pothole. By the time I walked back to it, the police had arrived and put out flares. They eventually closed the on-ramp entirely. It doesn't look like much, but the long axis is about 2 feet, and it was about 8" deep at the downhill end.