While I'm not familiar with the construction of hydraulic systems, I don't see myself benefiting from them as much as other technologies because I rarely use my brakes, even in stop and go traffic.
Where the technology would shine is a system that Old Mech(?) describes that turns the ICE on and runs at most efficient BSFC charging the hydraulic system, and then shuts off while that system maintains speed.
The whole idea of hybrids is to minimize modes of operation that are non-ideal. Those modes for an ICE being idling, partial throttle, and open loop. Unfortunately, those modes are the large majority of what an ICE spends time doing.
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