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Every hydrostatic drive I've seen specs on is way more inefficient than a manual tranny. Also worse than an automatic with a locking converter.
Using an accumulator for regen braking isn't new, either- a Portland guy tried to get the postal service and busses to use his system way back in the mid-seventies. It worked OK but didn't have the ROI back in cheaper fuel days.
Brings back fond memories of the Dale.
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