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James, I don't want to take this thread in the wrong direction. I was reading a consumers report last week and they tested a Leaf. Lost 15% of the energy charging the battery.
We should not fall into the trap of making comparisons of systems driven by hypermilers, the real world includes a lot of wasted braking energy and making a vehicle that recovers that energy at a rate of over 80% wheel to wheel will never be accomplished by any combination of batteries and capacitors that NASA could build today with unlimited funds.
On the other hand a hydraulic accumulator has a life expectancy measured in decades. Rebuilding it is a matter of replacing the rubber bladder. The cheapest capacitive storage you can buy today. Not something that may be available in a decade, not even considering the cost.
regards
Mech
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