If you're going to pay them $6k for overage miles then you might as well put that money as a down payment and buy the car out at lease end. You can also trade it in at a later date after you purchase it.
Good luck.
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2014 435i xDrive M-Sport, Fabspeed cat, Active Autowerke axle back, CTS Turbo intake, ER charge pipe, ER Competition Intercooler, MHD Tuning Stage 2+
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