Maybe we are referring to different cars? My 2015 m3 is a 4-door with a completely usable and generous back seat. My 2015 m3 is almost identical size to a 1997-2003 BMW 5-series - including rear seat room. I have sat 5 people comfortably in it for 30-60 minute drives. IT IS a tad stiff but actually has a pretty good -…