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Honda started adding electric power steering to their vehicles around 2000, depending on the car. The 2000 Insight was the first one with an electric rack (to my knowledge) which had virtually zero impact on economy. The 2002 Civic Si got a similar rack, as did the 2003 Civic hybrid.
This isn't an electro-hydraulic system, but rather, it's a small electric motor bolted right to the rack, that adds torque in the same direction you turn the wheel.
A properly maintained Insight will get ~100mpg @ 50mph. A 2003 Civic hybrid might get upwards of 60mpg @ 50mph. The Si you may get mid 30's.
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