Arguably, the most interesting vehicle that Mercedes is displaying at the Frankfurt Motor Show is their beautiful F700 research car concept, which Mercedes-Benz describe as a “rolling bed” of their latest technologies.

The F700 is powered by a unique drivetrain that features a Diesotto engine - a four cylinder, direct-injected, sequentially-turbocharged 1.8-liter petrol engine that can alternate between conventional spark ignition and extremely high pressure compression ignition (like a diesel).