GM has redesigned its full-size SUVs, and they are more fuel-efficient than ever.
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Over the past decade or so, the big three truck makers (Ford, Chevrolet, and Chrysler) have seen towing capacity skyrocket to never-before-seen levels.
For the new model year, GMC is upgrading two of its top vehicles.
We've already sampled the 2014 Chevrolet Silverado, but its upmarket twin, the 2014 GMC Sierra made its official debut today.