The biggest car reveal at the North American International Auto Show in Detroit this week was a truck — Ford’s new aluminum body F-150 pickup.

Building a truck with lightweight aluminum shaves about 700 pounds off the previous generation F-150 and will improve fuel efficiency, but it raised eyebrows inside and outside the automotive industry. Aluminum is a more expensive material to work with, and some wonder if truck buyers won’t yearn for the rugged reliability of trusty steel.

REAL-TIME updates from Detroit

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