Mercedes-Benz prototype with 620 mile range

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. https://www.mercedes-benz.com/en/classic/museum/mercedes-ben...

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.