Success!
(2 people and one bike because a friend had gone on a cycling trip and needed to be picked up)
Had to take both wheels off, but it fit just fine, with plenty of other stuff. I don't think we could have had any passengers in the back seats through. Wrap the frame in a blanket to protect the interior, and bring bungee cords to tie it all down.
MAUW not an issue unless the two POB are very portly indeed.