I have a 14 sierra cc all terrain, and I love it. Big step up over the 12 sierra I had. Huge improvement on interiors and exterior, IMO the best looking front end of any truck on the market. Personally i find the new fords to be fugly and im glad i went the direction i did. Fuel mileage has been better then I ever expected. About 12L/100k city if you don't have a lead foot, and around 10 on the highway. Obviously towing will increase this number but with a truck bed full of camping stuff I can make it to the shuswap on half a tank ( no trailer yet
) about 8-900kms a tank highway, almost had a 1000km tank last summer
Enjoy your new ride whatever you do decide on.