Cylinder deactivation....
In my 06 Odyssey, if I was paying attention, I could feel a tiny 'bump' when cylinders activated/deactivated. Also, I could hear a faint 'drone' when cylinders were inactive. With the new Silverado....I have not been able to detect any difference whatsoever. Maybe when I get fully 'in tune' with the truck's pulse, I will be able to detect it, but currently I cannot detect any change in sound or feel whatsoever. Pretty cool.
Oh, and the sound of the direct injection system is different than what I am used to hearing. Nothing bad, but it is definitely a different brand of 'sewing machine' than that of the 5.4 F150 I was used to hearing.