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Nissan has been selling an e-Power Note in Japan since 2016. This is the same powertrain with a step up in efficiency (if it works outside the lab)
My understanding is that although serial hybrids work well for low speed operation they aren't the most efficient way to transfer power at highway speeds. That is why the Prius, Volt, and pretty much every other hybrids is a series / parallel hybrid to allow the most efficient mode for the travel conditions.
Japan would have ideal conditions for a serial hybrid with their dense cities and low speed limits. (The highest speed limit I saw in my travels to Japan was 80 kph on an urban expressway.)
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