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Hydraulic accumulators can reach 99% efficiency, while you loose 15% just charging the battery on a Nissan Leaf. Just filling the "tank".
Best wheel to wheel efficiency of regeneration.
Hydraulic-close to 80% (in 2006).
Electric- close to 33% (also in 2006).
Remembering wheel to wheel, the hydraulic option allows for P&G while maintaining constant speed while gas electric hybrids can not exploit the highest levels of efficiency of an IC engine without giving away that same efficiency in conversion losses. The same applies for electric power, expecially when you use a simple direct drive that can not recover even a small percentage of regenerative energy.
It will be amusing when a decent HH car is actually built how the nay sayers will rationalize their ignorance.
rgeards
Mech
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