Must’ve been an addition on newer models then, I’ve heard it on a few others and the ford dealership says they have to have it. Some quick googling right before buying it brought up forums where ford owners figured out how to disable it though
Yea mine isn’t plug in either, still get mid 40s mpg though which is great. 600 miles on a tank is fantastic for an suv. I might’ve gotten plug in but the dealers didn’t want to or couldn’t answer any questions on them and really fet like they didn’t want to show/sell them