[devodave]

Based on driving in Western NY snow country on a regular basis, I'd keep it in 4WDAuto if the roads are anywhere near plowed (i.e. less than 3" of snow on the road). I have a 2016 Sierra and will try to stay in 2WD as much as possible as I don't like how the 4WD High affects the steering when I'm on and off clear pavement (windblown snow across the road provides a pucker factor!). 4WD Auto seems to be a good compromise. You can always shift (turn the little dash mounted knob) to 4WD High if the conditions warrant. And as others have stated, don't drive past your tires. Thats a lot of mass to try to stop when it gets icy (Blizzaks are currently mounted on mine and they do help immensely). I don't have the Lane Assist on my All Terrain model, so I cant offer any suggestion there.