31 City / 41 Highway / 35 Combined
$17,790

Redesigned and reimagined for 2019, the Kia Forte cracks the top 10 with its most-efficient FE model. The 2.0-liter inline-four engine underhood produces 147 horsepower (109 kilowatts), and helps return fuel economy of 31 miles per gallon in the city, 41 highway, and 35 combined. Annual fuel costs are a mere $1,050, according to the EPA.