Their numbers do not support the conclusion - but they were comparing deisels and they do say the the X5 is optimized for no road. I agree, I would not take a unibody car offraoding - that is for a good ladder frame Jeep, Defender Landcruiser or Nissan. But that is not what we buy of X5's for.

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07 X5 E70 4.8i
04 Z4 E85 3.0