I can think of 3 reasons: One, the X5 M50d costs $108k USD (82k EUR). Two, the price of diesel is 20-30% higher than Premium gas (at least in the Midwest), offsetting the fuel savings. Three, if you're going to pay $108k for an SUV, why not get the X5m Petrol or Porsche Cayenne Turbo?
The diesel SUV segment is already filled by the X5 35d, which gets better fuel economy and make sense to Americans.
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