corporate average fuel economy

Despite tepid industry sales last year, South Korean carmaker Hyundai set a sales record, thanks to savvy designs and sophisticated engineering. It's come a long way from an early econo-box image. Now, if it could just do as well at home.

What are car makers tooting their horns about? All the earth-friendlier engines at the Detroit auto show. Hyundai's plug-in Blue Will concept car and Nissan's all-electric Leaf are just a couple of the new models. Companies are keen to show they are serious about raising gas mileage and reducing emissions.