Flying Pancake
I don’t know what Dodge considers it, but if the backseat is comfortable for adults, then I’d call the Challenger a two-door sedan. For contrast, I’d probably call the Mustang a coupe; while you can get adults into the back, they won’t be comfortable for very long.
What if it’s a big coupe like a Dodge Challenger that can actually fit adults in the rear seats?
I don’t know what Dodge considers it, but if the backseat is comfortable for adults, then I’d call the Challenger a two-door sedan. For contrast, I’d probably call the Mustang a coupe; while you can get adults into the back, they won’t be comfortable for very long.