Hmm, you should measure the distance you cover via your phone. You may have a wonky wheel speed sensor, which could contribute to strange distance readings as well, but that would generally generate a DSC fault...
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2012 BMW 328i 6-Speed Wagon | Deep Sea Blue with Grey Dakota Leather | Manual Swap, 330i Intake + Tune, 3.15 Helical LSD, Öhlins R&T
(SOLD) 2009 BMW 128i 6-Speed Coupé | Monaco Blue with Black Sensatec | chris_flies' 128i thread
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