Released: August 13, 2008

Cars that cut your gas bill in half

Source: Sue Zesiger Callaway, Fortune Magazine (CNNMoney.com)

Attention, horsepower-hungry: Fear not the exploding array of environmentally friendly alternative vehicles. They are a hopeful signal of the potentially mind-blowing stuff to come.

Ferrari is exploring adding electric motors, which deliver peak torque from takeoff to top speed, to each wheel to capture regenerative braking energy to boost acceleration. Audi just won Le Mans for the second year in a row with a diesel racecar. The last time the automotive world saw this level of innovation was at the turn of the last century. Steam, anyone? 

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