Toyota Motor Corp. said Wednesday it will replace accelerator pedals on about 4 million recalled vehicles in the United States because the pedals can get stuck in the floor mats, another blow to the reputation of the world's largest automaker.

While not every state offers as big a rebate on the Tesla Roadster as Colorado does, there is a federal tax credit of $7,500 available to people who buy the electric sports car.

It's no secret that how you drive has as much – or more – influence on a vehicle's efficiency than any technology. Case in point is this week's Global Green Challenge in Australia. Simon Hackett shipped his 2008 Tesla Roadster down under for the event and proceeded to set a new world record for a production battery-powered vehicle.