For the first time Toyota has taken the top spot in the Harbour Report, a study that measures the auto industry's most efficient North American manufacturing plants. Toyota has passed the perennial leader Nissan in the study by increasing productivity by 5.5 percent last year. Chrysler gained 4.2 percent, bringing the time to produce a vehicle to an average of 35.85 hours. GM has made the biggest gains in North America over the past five years.

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