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I don't think allot of people realize is that RF tech as improved considerable over the years. Looking up the specs for the stock run flats on the F30 are quite good and give nearly the same Milage life as normal tires. Your only concern with run flats should be ride quality and track performance on rims larger than 18. 19s Are a hard ride + RF = even harder. Ideally the average driver will be perfectly fine with RF flats. Theres a 5th gear video on youtube that shows a 5 series on a track racing with deflated run flats. Tiff was genuinely impressed.
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