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There has been quite a lot of work done with hydraulic hybrids, but the application area seems to be trucks that do a lot of stop & go driving - USP delivery vans, garbage trucks, and similar.
My impression from what I've read is that hydraulics are really efficient at storing braking energy & using it for the next start, but heavy and don't have a lot of storage capacity. That makes them a good fit for stop & go things, not so good for a typical car.
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