Plug-in hybrid car energy efficiency

The following table compares EPA's estimated out-of-pocket fuel costs and fuel economy ratings of serial production plug-in hybrid electric vehicles rated by EPA expressed in miles per gallon gasoline equivalent (mpg-e),  versus the most fuel efficient gasoline-electric hybrid car, the 2016 Toyota Prius Eco (fourth generation), rated 56 mpgus, and EPA's average new 2016 vehicle, which has a fuel economy of 25 mpgus. The table also shows the fuel efficiency for plug-in hybrids in all-electric mode expressed as KWh/100 mile, the metric used by EPA to rate electric cars before November 2010.