A lot depends on how you drive the car, and how you maintain the tires. Bigger wheels (19" or 20" for example) mean more expense: greater wear, higher vulnerability to damage from curbs and potholes, and higher replacement costs. Although it's admittedly a lighter car, my E92 with sport suspension and 18" wheels got a bit more than 30,000 miles from the OEM set of run-flat tires.
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