The 2013 Chevy Malibu ECO, “Most Fuel-efficient Mid-size Sedan Chevy Has Ever Built.” The new ’Bu is expected to earn EPA ratings of 26 mpg city and an amazing 38 mpg highway. That’s a better highway fuel-economy performance than offered by some subcompacts—and some hybrids, too. As just one example of their work, the Malibu ECO will showcase the first use of electronically controlled lower-grille shutters in the mid-size segment. The shutters stay open for improved engine cooling during low speeds or when the car is under a heavy load—such as when it’s traveling uphill—then close at highway speeds to help the Malibu ECO slice through...