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It does have the cylinder deactivation on the Sierra

 

And is said to tow about 12,000 pounds.  Mileage estimates are 14 city / 20 hgwy for the 4WD model.


Honestly, the 5.3L model I tested seemed very sufficient.  It does a few MPG better than the 6.2L and will tow almost the same.  Still, those with the 6.2L can say "I have the Vette engine in this!"

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