Many of the cars now on America's roads get no better gas mileage than the ones we were driving twenty years ago. Meanwhile, other country's cars are leaving ours in the dust in terms of fuel efficiency. How did this happen, and what are American auto manufacturers doing about it? A former auto industry engineer and NOW correspondent, Jonathan Silvers goes under the hood of the U.S. car industry to look at what's being called a colossal failure of American engineering. Does Detroit have a secret weapon waiting in the wings? X