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Is Detroit producing too many cars? Where the selling was smart, the answer seemed to be no. Last week Chrysler Corp.'s Vice President James Cope measured the auto market. Cope's statistics: 17 million American families still do not own a.car; 89% of the owners have only one; nearly 30% of the people between 30 and 40 years old do not drive. On top of that, one-fourth of the 45 million autos on the roads are a dozen or more years old, and will soon have to be replaced.