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2014 GMC 2500 HD LML 6.6

Welcome to TTS. The milage on the newer trucks is already better than its predecessor was, but any real gains will require tuning. There is emissions intact tuning out there that helps reduce regens, which in turn helps MPG's. Otherwise make sure your tires are fully inflated and switch to synthetics for your oils. Once they've got 15K miles or so, they're broke in, and getting about as good as you can hope for.
 
Well The long term average including morning warm ups and Idling was 16.2MPG, reset the Trip after 35K and I am getting 18.9 MPG Hwy unloaded and 15 Hwy pulling a 7-9k lBs 28ft trailer.

I guess that's pretty good since it is a 4X4 Z-71 Crew Cab short bed.

I have a 2001 Dodge 1500 4x4 with Xcab short box 360 Cubic Inch Gas that gets 10.5 MPG all day long empty and 6 MPG towing a 9K LB 32 ft. Travel Trailer.
 
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