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Having better coasting with no idling is more important to high efficiency. If you accelerate less, and then coast, and only use regen to slow down, then that is better overall.
The thing we are all most concerned about is the amount of energy we have to put into the car, right? If you put in electricity mainly, then that is good because it can come from renewable sources.
Unless you can pressurize the accumulator in an hydraulic hybrid and do that with renewable electricity, then you are forced to only use liquid fuels - and these by definition are limited to 25-35% efficiency.
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