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Parkers overall rating: 4.1 out of 5 4.1

Miles per pound (mpp) Miles per pound (mpp)

Petrol engines 4.2 - 5.7 mpp
Diesel engines 6.5 - 6.7 mpp
Low figures relate to the least economical version; high to the most economical. Based on WLTP combined fuel economy for versions of this car made since September 2017 only, and typical current fuel or electricity costs.
  • No BMW 8 Series Convertible model is cheap to run
  • Expect expensive tyres and other consumables
  • The diesel model consumes considerably less fuel

Whether you pick petrol or diesel it’s fair to say that the BMW 8 Series Convertible will cost you more to run than a 1 Series Hatchback, in terms of fuel, insurance, consumables and servicing.

Of the two models the diesel is the clear winner when it comes to fuel consumption, promising 45.6mpg to the petrol’s 28.5mpg.

Both figures will dip with sporty driving but we’d expect the diesel to offer reasonable economy even when you choose to exploit its full potential.

You’d imagine a large, heavy convertible like the BMW 8 Series to produce a substantial amount of CO2 and in the case of the petrol you’d be broadly correct – the M850i clocks in with 225g/km.

In the case of the diesel-powered 840d however things are considerably better, 161g/km of CO2 despite that punchy 0-62mph time and hefty torque figure.

  • New model with new engines
  • BMW has a strong record for reliability
  • Shouldn’t need to worry much

Given the BMW 8 Series Convertible’s newness it’s hard to say exactly how well it will perform in this area but given the prolific use of engineering and technology from throughout the BMW parts catalogue, you shouldn’t have much cause for concern.

Ongoing running costs

Road tax (12 months) £465
Insurance group 48 - 50
How much is it to insure?