Does anybody know where you can find a Tesla approved list of tires? I need to return my P90D (lease return) in September and I need new 21". I'd like to save some money and buy less expensive tires but I want to make sure Tesla will accept them. I've heard from my Tesla SC that there is a "Tesla approved" list of tires but they didn't have the list. Does anyone know if such a list exists or what the cheapest (decent) tires Tesla will let me return the car with?