Since then, several manufacturers have had a stab at the genre, but with the 840d xDrive Convertible BMW has maintained its reputation for exploring and filling niches you didn’t really know ...

BMW claims up to 38.2mpg with 168g/km of CO2, to the V8’s 28.5mpg and 229g/km. The 840d xDrive goes even better at up to 45.6mpg and 162g/km, though that gulf is hardly vast. Forward of the A ...

In 840d form, the 8 Series is in a class of its own: a diesel luxury coupé that’s relatively cheap to run, offers very strong performance and is capable of covering long distances between fill-ups.

In 840d form, the 8 Series is in a class of its own: a diesel luxury coupé that’s relatively cheap to run, offers very strong performance and is capable of covering long distances between fill-ups.