I have a few questions about tires. If anyone has replaced the tires what brand did you use? Also, if you did replace the tires did you get run flat tires like the original or standard? If you got non run flat tires, how would compare the ride quality and performance? Lastly, does anyone know if the car can be turned in at the end of an Ally lease with standard non run flat tires? FYI, my car has 18" tires and MRC. Any information that you can provide will be appreciated. Thanks.