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If you did any research you would have discovered the problems with run flats : noisy,rough ride, expensive and poor mileage . Owners have been complaining about these problems since they were original equip. I just finished driving a 2012, 330 loaner and found the noise and hard ride to have lessen from previous years. Of coarse , this is a lighter car than the 750i and has much smaller and presumably quieter tires. I intend to ask my body shop what they would charge to build a spare tire compartment in the trunk. I will not buy any B M W with run flats and will Audi if they don't discontinue them before I am ready to buy my next 7 series.Report it