BMW AG BMW.XE -0.25% recently reported it sold 21,297 of its flagship-brand cars in the U.S. in July. But those numbers are not as straightforward as they appear.The company made a special offer to dealers on July 31. For one day only, the dealers would receive discounts of as much as $7,000 per 2012-model car as long as each vehicle was reported as sold that day.The number of such deals raises questions about the accuracy of the company's reported sales, a closely watched figure as BMW and rival Mercedes-Benz vie for the title of top-selling U.S. luxury brand.
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