32 City / 42 Highway / 36 Combined
$38,515

Believe it, the Jaguar XE Diesel is the third-most fuel-efficient car in the U.S. in 2019. Granted, it's a trim of a sedan that typically isn't near the top of any fuel efficiency lists, but it's a Jag nonetheless. The XE diesel, powered by a 2.0-liter four-cylinder producing 180 horsepower (134 kilowatts), gets up to 36 miles per gallon combined – which rivals the next two cars on this list. But it owners an average of $1,300 per year in fuel.