April 21, 2011 Malibu ECO: Most Fuel-Efficient Chevy Midsize Ever Edit Delete Tags Autopost The all-new Chevrolet Malibu sedan made its North American debut this week at the New York Auto Show. While it’s a bold new direction for the popular Malibu, one of the most notable changes to this vehicle is the addition of the “ECO” model, which delivers the best fuel economy of any Chevrolet midsize sedan ever in the company’s 100 year history.