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The most important factor to vehicle efficiency is the efficiency of the drivetrain.
Since electric motors are ~3X more efficient that ICE's, any drive train that can leverage the electric portion of it's drivetrain enough, will end up being more efficient overall. Another way that hybrids improve is to use the electric motor to allow the ICE to run in a more efficient way, and to work around the weaker aspects of the ICE; one of which is idling and having high enough torque to accelerate the car in the most demanding situations.
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