...when I saw it, I knew exactly what it was.
A Buick Envision.
Wish I had my camera, but I know it was the real thing.
Conveniently, there was an Equinox a couple cars back, and it was about the same size, maybe slightly larger.
Complete with the rear covered in plastic cladding and an almost completely exposed front end. Michigan 'M' plates, too.
Also, I saw my third Tesla Model S, this one was dark blue.
Coincidentally, the first two Model S I ever saw were red and white.