DETROIT - Detroit's biggest seller of luxury vehicles isn't Cadillac anymore. It's GMC. GMC's high-end Denali and AT4 lines are outselling General Motors' traditional luxury brand in the U.S. this year, according to figures from GM and the Automotive News Data Center. The automaker is building on Denali's ability to command luxury prices by expanding the AT4 off-road subbrand and planning a pair of high-performance electric vehicles that will revive the Hummer name.
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