[bobkatfly]

I'd add this feature to the useless fluff additions to vehicles. Active Fuel Management on many GM vehicles, especially trucks since about 2007. The system deactivates 4 of the 8 cylinders during low load driving in an effort to increase fuel efficiency. There are reports of excessive lifter wear leading to other issues involving cam shaft and engine failures. These problems may have been isolated to earlier years and exacerbated by poor maintenance and hard use but i think the jury's still out on that.
The system involves the addition of many new engine components that are controlled by the engine main control board.
I own a 2016 Silverado that I purchased in 2019. I drove it for 4 years before I installed an AFM disabler and haven't noticed an appreciable change in fuel use. I do regular maintenance and luckily haven't had any issues but still, all this for maybe a few percent fuel savings.