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Officially BMW states 2000km as break-in period; in practice I found with all my other (non-BMW) vehicles to stabilize fuel consumption from 10 000+ km's. Also depends whether you use on-board computer reading/s or note it manually on app like Fuel Log 3 (i-Phone) or Internet site like Spritmonitor.de (also available in English) - eventually also traffic conditions and of course the weight of the (R) foot/boot...Regards.
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