According to the Associated Press, Ford's 2015 version of its best-selling F-150 pickup, which starts arriving at dealerships next month, will have a lot of aluminum rather than steel in its body.

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Aluminum is lighter and more expensive than steel but just as tough. The new truck is the company's response to customers' requests for a more fuel-efficient pickup. Ford hopes the advantages outweigh customer doubts about the durability of aluminum or potential repair costs for the pricier metal.

It's a big risk. Morgan Stanley estimates F-Series trucks account for 90 percent of Ford's global automotive profit. The trucks have been the best-selling vehicles in the U.S. for 32 straight years. Last year, Ford sold nearly 100,000 more full-size pickups than General Motors.