27.5mpg??? Wow! Is that normal for the diesel? How much higher do you expect it will go after break-in? For comparison I'm getting 15-18 with a still new 4.8...

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2001 X5 4.4 - Retired
2008 X5 4.8 - Delivered 2/1/08
Active ventilated seat | Cold weather | Premium package | Premium sound | Rear climate | Technology | Auto tailgate | Comfort access | Running boards | Heated rear seats | HUD | HD radio | Satellite radio | iPod/USB