My white 2014 had over 20,000 miles from April to December and never used any oil. All three oil changes completed by the dealership when the OLM told me to change it. Truck didn't smoke, leak or burn oil. I ran it on 87 octane and according to my fuelly account I tracked 15220 miles and averaged 15.5 mpg. It was a 5.3L 6sp w/3.42 gears I put it in auto and let it do its thing.
20,000 is half of 40,000....which is where the oil consumption problems seem to start showing up. I'm sure some of us would spend more time in V4 than others, thus some may get more miles before problems show up, or have no problems at all. GM didn't do this because it is good for your motor, they did it to help meet CAFE standards. Why take the chance if you plan on keeping your truck?