Mercedes had aerodynamic fastback prototypes in the eighties already but they didn't make them as people wanted to buy boxy cars. I remember seeing this on TV as a kid. <a href="https://www.mercedes-benz.com/en/classic/museum/mercedes-benz-auto-2000/" rel="nofollow">https://www.mercedes-benz.com/en/classic/museum/mercedes-ben...</a><p>Even today cars with an aerodynamic rear and big boot opening are not very common - many makers only have a sedan with a tiny opening and very short hatchback.