The following table compares official EPA ratings for fuel economy (in miles per gallon gasoline equivalent, mpg-e or MPGe, for plug-in electric vehicles) for series production all-electric passenger vehicles rated by the EPA for model years 2015,[1] 2016,[2] 2017,[3] and 2023[4] versus the model year 2016 vehicles that were rated the most efficient by the EPA with plug-in hybrid drivetrains (Chevrolet Volt – second generation), gasoline-electric hybrid drivetrains (Toyota Prius Eco - fourth generation),[5][6][7] and the average new vehicle for that model year, which has a fuel economy of 25 mpg‑US (9.4 L/100 km; 30 mpg‑imp).
[2][5] EPA rating data are taken from manufacturer testing of their own vehicles, usually conducted using pre-production prototypes.
(2) The 2014 i3 REx is classified by EPA as a series plug-in hybrid, while for CARB is a range-extended battery-electric vehicle (BEVx).
The i3 REx is the most fuel economic EPA-certified current year vehicle with a gasoline engine with a combined gasoline/electricity rating of 88 mpg-e, but its total range is limited to 150 mi (240 km).
(7) Model with 85 kW·h battery pack (8) Most fuel economic plug-in hybrid capable of long distance travel.