You'd expect a compact coupe with a Toyota badge to earn good gas-mileage numbers, and you'd be right, with the Scion tC. In the wider scope, though, some mid-size sedans have it beat.
The EPA gives the tC a rating of 23/31 mpg, no matter whether you opt for the six-speed manual or the six-speed automatic. The numbers represent a few miles per gallon better efficiency than the first-generation tC. However, Toyota's own Camry will best the tC on the highway cycle, and so will more spacious hatchbacks like the Kia Soul.