cafe standards

Last week, the auto paparazzi brought us pictures of the prototype 2013 Corvette, which will apparently reprise the classic Vette formula. But in an era of high gas prices and tightening environmental regulations, how much longer can GM's horsepower party last?

Toyota, maker of the popular Prius hybrid, is preparing to move into other alternative-fuel technologies such as hydrogen fuel-cells and biofuels. Its recent large investment in Tesla Motors is just the first such partnership the world's largest automaker is pursuing.

The price at the pump may soon top $3 a gallon. The higher prices come as carmakers take stock of new regulations that will require them to achieve fuel efficiency of 35.5 miles a gallon -- an increase of nearly 10 mpg above current standards -- by 2016.

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.