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The bigger issue is the average efficiency of the drivetrain as a whole.
Their electric motor is probably 92-94% efficient ALL THE TIME. No need to warm it up, or maintain the right RPM.
Toyota had a chance to really up the ante - and they barely managed a tweak. The aero could be better, and they need to go big battery with plugin charging.
The Tesla Model S is about TWICE the efficiency as the Prius.
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