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In-depth reviews

BMW 8 Series review - MPG, CO2 and Running Costs

BMW 8 Series running costs are par for the course, but high enough to make most drivers wince

Tiresome though the news may be, if you’re forced to factor running costs into your new car purchase, it’s highly unlikely the M850i is the right model for you. BMW says it will cover up to 26.9mpg under WLTP test constraints, but if you’re even slightly tempted by its phenomenal performance, the true MPG figure will drop like a stone. Driven briskly, we certainly wouldn’t be surprised by MPG in the teens – high or low.

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Equally the 224-227g/km of CO2 emitted under test conditions is unlikely to match real world use, but at least that won’t cost anything more from a financial perspective. The car is in the maximum Benefit-in-Kind bracket, too, so you’ll be whacked by the tax man if you run an M850i on the company, although it’s a similar story for any high-performance company car – unless it’s a hybrid or electric.

The BiK rate is the same for the diesel 840d, but 154-166g/km of CO2 (depending on wheels and bodystyle) is an improvement. The potential mixed driving economy of up to 40.4mpg (in the Coupe) will be less hard on your pocket, too. The extra economy pays dividends with range – you’ll be spared filling up so often on trans-continental jaunts as the range is a realistic 500 miles.

Figures for 640i models sit in the 31.7-33.6mpg and 160-170g/km range depending on bodystyle. In all cases, the Coupe models are most efficient and the heavier Gran Coupe is the least.

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The go-faster M8 Competition returns 25.4mpg in Coupe guise and 25.2mpg as a Convertible. CO2 emissions are 242g/km and 246g/km respectively.

Insurance groups

The Association of British Insurers has assessed both the new 8 Series models as insurance group 50, which means sky-high premiums for anyone not on a multi-car company-type policy, or on very good terms with their broker. It’s no surprise though, as all high performance and luxury cars are expensive to cover.

Depreciation

Demand is likely to be strong for the 8 Series in the first few years, and at launch it has predicted residuals of 52-54 per cent after three years. Given the current lower demand for diesel, the 840d is at the lower end of the scale, while the M850i is better served. The coupe holds on to slightly more of its value than the Convertible, too. In comparison, the Mercedes S-Class Coupe and hangs on to anything from 41-56 per cent of its value after three years and 36,000 miles.

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Which Is Best

Cheapest

  • Name
    840i sDrive 2dr Auto
  • Gearbox type
    Semi-auto
  • Price
    £71,725

Most Economical

  • Name
    840d xDrive 2dr Auto
  • Gearbox type
    Semi-auto
  • Price
    £76,055

Fastest

  • Name
    M850i xDrive 2dr Auto
  • Gearbox type
    Semi-auto
  • Price
    £99,330
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