The Volt (EREV) and the Ford C-Max Energi (PHEV)

2013 Ford C-Max Energi

2013 Ford C-Max Energi is a PHEV (Plug-in Hybrid Electric Vehicle)

GM calls the volt an extended range electric vehicle (EREV).  It is an electric vehicle with a gasoline generator for extended range.  The C-Max Energi is a plug-in hybrid electric vehicle (PHEV).  It’s a hybrid drive with electric and gas drivetrains similar in design to the well known Toyota Prius.  The electric drive must be more substantial for the Energi than the hybrid.  I’m sure this is why the Energi gets slightly lower MPG than the hybrid when running in the hybrid mode.  There is a lot of discussion about which approach is better, EREV or PHEV.  Here’s two links (here and here) where General Motors claims the EREV is the better approach.  What do you think?


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2 thoughts on “The Volt (EREV) and the Ford C-Max Energi (PHEV)

  1. The battery being heavier and the electric motor a bit heavier would explain a lower MPG, but I find it hard to believe thats the only reason, considering re-gen should compensate fairly well for weight.

    A more powerful electric motor in itself should not lower MPG at all basically since it takes the same energy (theoretically) to move something at a certain speed, no matter the acceleration.

  2. Thanks John. That makes a lot of sense to me. It would be interesting to know why the C-Max Energi MPG ratings for the Energi (not the MPGe) are lower than the C-Max Hybrid.

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