While the SE and Limited have a 2.0-liter Atkinson-cycle four-cylinder engine rated at 147 horsepower and 132 lb-ft of torque—and the Sport gets a 1.6-liter turbocharged four—
the Eco’s exclusive engine is a 1.4-liter direct-injected turbo four, good for 128 horsepower and 156 lb-ft of torque.
As in the Sport, the only transmission for the Eco is a seven-speed dual-clutch automatic.
The combo delivers EPA ratings of 32 mpg city, 40 mpg highway—making it the only Elantra to hit the 40-mpg mark. (The next-most economical version is the SE with its optional six-speed automatic, which is rated at 29/38.)