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there are lots of cars with non-hydraulic power steering.......I am in the UK and I know of a few, in fact the car I currently drive has one (MGF).
it is basically like a starter motor connected to the drive shaft, only comes on when it is needed and should be worth a few MPG, besides being the smoothest steering I have found so far. No more hydraulic fluid & the part is about the size of a starter motor with a little computer to control it.
If you are thinking of making one or retrofitting the problem is the computer - I am planning to do some research on it anyway if I move on and will post some results if anyone is interested.
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