According to the Fueleconomy.gov website, the list of the top ten most fuel efficient light vehicles includes nine electric vehicles and one plug-in hybrid-electric vehicle.
Electric vehicle fuel economy is measured in miles per gallon equivalent, or MPGe, where 33.7 kilowatt-hours of electricity is equal to one gallon of gasoline.
The Hyundai Ioniq Electric, with a combined city/highway fuel economy of 136 MPGe tops the list for model year (MY) 2017.
Three vehicles tied for the fifth spot on the list – the Fiat 550e, the Mitsubishi i-MiEV, and the Nissan Leaf – with 112 MPGe.
The BMW i3 REX, a range-extended electric vehicle, has a combined gasoline/electric city/highway fuel economy rating of 88 MPGe.
Top Ten Most Fuel Efficient Vehicles for 2017
Vehicle Photo | Vehicle | Combined Fuel Economy (MPGe) | City/Hwy Fuel Economy (MPGe) |
 | Hyundai Ioniq Electric | 136 | 150/122 |
 | BMW i3 BEV (60 Amp-hour battery) | 124 | 137/111 |
 | Chevrolet Bolt EV | 119 | 128/110 |
| BMW i3 BEV (94 Amp-hour battery) | 118 | 129/106 |
 | Fiat 500e | 112 | 121/103 |
 | Mitsubishi i-MiEV | 112 | 121/102 |
 | Nissan Leaf | 112 | 124/101 |
 | Kia Soul EV | 105 | 120/92 |
| BMW i3 REX (94 Amp-hour battery) 0.6 L, 2 cyl, | 88 | 95/81 |
 | Mercedes-Benz B250e | 84 | 85/82 |
