Once upon a time, St.
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General Motors is leaner and meaner, but is it greener?
We take a look at the just unveiled 2015 GMC Yukon Denali and Yukon XL, and drive the Sierra Denali with the new Ecotec3 6.2-liter engine.
The all-new 2014 GMC Sierra has undergone specific design changes to boost both fuel efficiency and interior quietness, after spending a major portion of its development time in a wind tunnel.