The EPS is more efficient by a marginal amount ~ 4%. Also, IIRC - The only way to get stop/start was with EPS steering, due to the way a hydraulic pump works.
Porsche is the best with EPS steering, but go drive a 997, the hydraulic is better in my opinion. The weight distribution of a 911 and a Cayman really help the EPS, without all that weight on the front end, the switch to EPS is less noticeable than a front engine car.
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