We were incredibly impressed by the diesel version of BMW's 3-series, although a lot of that had to do with the car's updated iDrive interface. But our heightened expectations for the diesel X5 were not met. Mileage was good, but not dramatically good, and trying to get through city streets felt like tug boat piloting. Worse, the diesel X5 is saddled with the old version of iDrive.
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