Stop in for a cup of coffee

My 2020 Durango SRT doesn’t have it. Maybe it’s only on certain models?
Yes it does. Chrysler and Ford are more "stealthful" about the situation than GM AFM and GM DOD. On my GM I could watch the dash display and see V8-V4-V8-V4 going on back and forth adnuseaum. I guess not likely on any Chrysler or Ford product because of the nasty reputation of cylinder deactivation in general and the law suits.

Exhaust and Active Fuel Management (MDS)