Automakers race to lose weight

Beneath the high ceilings of a factory in the wheat fields of Emilia-Romagna in northern Italy, Lamborghini engineers are building a new supercar. Called the Aventador, it has been described as the closest thing to a stealth fighter jet you'll see on the road. It's also a high-profile symbol of a strategic battle taking shape in the auto industry.

By Ludwig Burger and Helen Massy-Beresford

January 31, 2012