The 2013 Fuel Economy Guide, published by the EPA and the US Department of Energy, also gave high fuel-efficiency marks to vehicle models made by Ford, Mitsubishi, Daimler AG automotive branch Smart, Toyota and Tesla. The guide ranks fuel economy leaders in each vehicle category from two-seaters and minicompacts to midsize and midsize station wagons.
The Scion iQ EV was the most fuel efficient car overall and in its minicompact class, with miles per gallon equivalent of 121 combined, 138 city and 105 highway.
The Honda Fit EV, the second most fuel-efficient car, topped the small station wagon class with 118 mpg equivalent combined, 132 city and 105 highway.
This year, the EPA and DOE added a second top 10 list of most efficient vehicles that includes only conventional gasoline and diesel vehicles. In that list, the Toyota Prius was the most efficient with 50 mpg combined, 51 city and 48 highway.
Other 2013 models powerd by conventional fuel that topped their respective classes in efficiency includes the Toyota Prius v, Ford C-Max Hybrid, Chevrolet Spark, Audi and Scion iQ.
The least fuel-efficient cars by class included 2013 models made by Bentley, Bugatti, Cadillac, Ferrari, Mercedes Benz, Maserati and Rolls-Royce.
Meanwhile, Consumer Reports said road tests showed the 2013 Fusion Hybrid sedan and C-Max Hybrid fall short of the estimated 47 mpg fuel economy rating assigned by the EPA.
Consumer Reports said Fusion Hybrid had a 39 mpg efficiency overall, 35 mpg in the city and 38 mpg in highway conditions. Road tests showed the C-Max Hybrid had a 37 mpg efficiency overall with 35 and 38 for city and highway, respectively.
Last month, Hyundai Motor America and Kia Motors America agreed to lower the fuel economy ratings for more than one million vehicles sold in the US and Canada, after an EPA investigation found the automakers overstated mileage claims in 13 models.
The auto companies, which are both owned by Hyundai Motor Group, said they will lower fuel economy ratings for about 900,000, or 35 percent, of the group’s 2011-2013 model year vehicles sold in the US through October 31, 2012. Another 172,000 vehicles sold in Canada also had overstated mileage claims, Hyundai and Kia said.