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If you want your F10 speedo to run spot-on, swap out your stock run flats for a set of non-run flats that are 245/45/19 size (assuming your wheels are 19"). That's what I did and now it's exactly correct at all speeds according to my GPS.
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 2012 535ix Space Gray, Cinnamon, SAT, Premium, Prem sound, Cold W., Sunshades, Gloss Black Grille, Gloss Black Side Markers, RE970AS 245/45/19 non-run flats that run very smooth + quiet and also correct the otherwise optimistic speedo
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