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Paul Sancya, Associated Press
The Chevrolet Tru 140S Concept Coupe is shown at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012.

DETROIT — Chevrolet is aiming a pair of concept cars at the Millennial generation, giving them a look at what the outside of the coupes might look like and asking them to help design the interiors.

The General Motors Co. brand on Monday unveiled the Code 130R and Tru 140S at the North American International Auto Show in Detroit. Both offer room for four, and promise a fuel-efficient 40 mpg. Neither has an interior made and Chevrolet will seek public input on that.

The two-door Code 130R borrows from the look of a muscle car. The Tru 140S hatchback is designed as an affordable version of an exotic sportscar.

Chevrolet, like many other automakers, sees the roughly 70 million Millennials born in the U.S. between 1981 and 2000 as a growing market.