2013 MAZDA MAZDA3

The horsepower wars that besiege luxury and sports cars, and even full-size family sedans, largely bypass the compact-car class. Whether due to cost or design, power yields to efficiency in this class. Yet the 2013 Mazda 3 is among the few that deftly combines both.

Introduced last year, Mazda's new direct-injected 2.0-liter four-cylinder engine (dubbed Skyactiv-G) returns as the star of the Mazda 3's power trio. Joined to a six-speed manual or six-speed automatic transmission, this engine helps the Mazda 3 achieve 40 mpg on the highway without resorting to tricks like special aerodynamics or automatic transmission shift programming that settles into the highest gear before you've left the driveway.

Nor has the increased efficiency compromised horsepower. The Skyactiv engine slots between the 3's base 2.0-liter and top-end 2.5-liter engines, and its acceleration times are quite competitive for the class.