My wife just called to say that on her drive to work the car started to vibrate at speeds above 40 mph. Thinking it was a flate tire and or snow accumulation in the wheel wells she pulled over and checked. Tires are good and no snow. She said that the vibration is coming through the seat and she cannot isolate it. She did say that there is little or no vibration in the steering wheel. Makes me think it is something with a rear wheel or a serious drive train issue. Called the dealer, she is afraid to drive it so it looks like they are going to tow it in. The dealer says they are busy and may not even get to it till next week. Hopefully its just a bad tire,, I want to have a car over the holidays.