The GMC Yukon gets updated powertrains, new fold-flat rear seats, and a trimmer new look for the 2015 model year, following a year after the truck brand's complete renovation of its Sierra 1500 pickup truck. The Yukon family of SUVs--Yukon, long-wheelbase Yukon XL, and luxurious Yukon Denali--adopt many of the changes applied to the...
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