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Already answered that question Neil, pick your power source. The HH is a method of optimizing the peak power capabilities of any power source. Restricting the operating range of IC engines to only their peak BSFC is possible using a HH powertrain, which is why the efficiency of the INNAS design was doubled.
If you use a powertrain desgin that is not optimized for application of only best BSFC operation then you sacrifice efficiency.
High efficiency regeneration is effective with BEVs or IC powered vehicles since it consitutes a load leveler. P&G while vehicle speed remains constant is only possible with a HH powertrain with improved mileage.
It also allows elimination of throttle control and manifold vacuum altogether.
regards
Mech
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