2013 x5 has the hydraulic steering. Hydraulic is less efficient because the constant load in the engine. Electric on uses energy when turning. Currently, the electric are precise but lack road feedback. The electric has been tuned lighter steering effort. You really need to drive to know which one you like.
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2012 BMW X5 Vermilion Red Xdrive35d with Premium Package, 3rd Row Seats, and Adaptive Drive