hydrogen fuel cell

Fuel efficiency remains the top concern among new car buyers around the world, which is likely to boost demand for hybrid and electric vehicles, according to a report from KPMG. But the survey of senior auto-industry executives worldwide also showed that many have serious concerns about such vehicles' affordability.

GM is taking a big step toward making hydrogen-fueled cars and trucks a reality for consumers by partnering with a dozen companies to build more than two dozen fueling stations in Hawaii. The state is aiming to reduce oil to 70% of its needed energy supply.

Toyota Motor's recent $50 million investment in electric-car upstart Tesla Motors is already paying dividends. Tesla reportedly will ship two prototypes, based on Toyota's RAV4 sport utility vehicle and Lexus RX crossover, to the Japanese automaker later this month.

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.

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.