My paranoia proved founded. On Tuesday I went to the dealership to get an oil change. The front office clerk informed me that I had a nail in my tire and it was in such a place that the tire could not be patched. They said I needed a new one. I did know that my tire indicator light had been on for a few days, but had put it down to the change in temperature. I declined buying from them letting them know I believed my tires were still under warranty at Costco. They said they would fill up the tire and that I should get it taken care of immediately. Now, there were a few strange things about this situation. They never showed me the nail. They identified the tire in question as the driverside rear tire unless it was the driverside front tire. They weren't sure because the mechanics had rotated them. Another thing that rang strange was that they wanted to fill the tire with air instead of putting on the donut. In any case, I went to Costco today because you can't get tire service without an appointment. Not only did they not find a nail in a dastardly location, but they found no nail whatsoever. No puncture whatsoever. It is now my belief that they knew I saw the tire indicator light and thought they could get away with upcharging me and selling me a tire or maybe two if I wanted my car balanced that I did not need.