Could it also be because once you get to the higher speed you are actually not optimising your fuel range and so the software recommends reducing speed (as engine is working harder - higher revs etc.)?
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F20 125i M-Sport EB|M-Brakes|Bi-Xenon Lights|Sunroof|Hi-Fi System|Prof.Nav.|PDC Front/Rear|Tinted Windows|Lights Package|Ext. Instrument Cluster|Connectivity,B'tooth,USB|
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