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Originally Posted by The HACK
No way. That's like saying the hydraulic pump saps up to 5% of power. Where did you get that figure?
At most, it's the difference in maybe .1 mpg. Well within statistical error.
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Studies show HPAS on small engines can use up to 15% of the power, less (10%) on larger engines. That does seem high, but those are the sort of figures quoted in worse case applications.
Using EPS definitely reduces consumption. The 0.4 l/100kms figure below, comes up in a lot of the studies.
From ZF:
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Depending on vehicle type, ZF Servolectric consumes over 90% less power than hydraulic steering solutions. This means in particular that, for the NEDC driving cycle, the fuel consumption is reduced by 0.4 l/100 km, and city driving up to 0.8 l/100 km fuel savings can be realized.
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Working the maths show these are not insignificant figures to be ignored, particularly when you are talking of diesel cars capable of under 6 l/100kms.