I ordered a 335d (no sport pkg) and biding my time until it comes in. Meanwhile I am trying to research the dealer offered run flat tire insurance. I purposely decided not to order the sport pkg because the tires will cost more to replace over time. I also plan to go to non RFT when the orginals wear out. Will I void the car's warranty if I do so? I also read BMW was replacing tires for new cars with less than 10K miles. What can I expect? Is $1000 for RFT insurance worth it? My instincts say no but looking for input from people who bought.