SINGAPORE (Reuters) - When South Korean automaker Hyundai Motor Co announced last month it had overstated the fuel efficiency levels on around one million of its cars in the United States and Canada some investors were left fuming more than others. Some had already sold their shares before the announcement on November 2. The stock fell 4 percent on November 1 with about 2.2 million shares changing hands, the highest trading volume of the year at that point. ...

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