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We have the 18d sDrive, seemed to get 44mpg every tank, however since our second service at 25k miles it now seems to get closer to 45/46 mpg.
So gone from 6.3 to around 6.1l/km.
This car doesn't like motorways though, not geared for it, likes 65mph (105kmph) , will see 5L/km at that speed, but jump to 80mph (130kmph) and it drops to 45mpg again (6.3L/km).
My Mercedes 3 litre diesel tuned to 280bhp and a much heavier car only gets 35mpg average, which is 8.1L/k, but sat at 80mph and it will see as good as the little X1.
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