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BMW 6-Series M6 (2005-2010) running costs and reliability

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Running costs rating: 1 out of 51.0

Written by Simon Harris Published: 6 June 2019

Miles per pound (mpp)

Reliable fuel consumption data for comparison purposes is not available for this model.

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Fuel economy

A more stringent standard for fuel economy (WLTP) was introduced from September 2017, and this model was not required to undergo that test. Its fuel economy measured under the previous test system was 19 mpg. However these figures are less likely to be achievable in real world driving and so should never be compared to another car's mpg which was measured under the newer, more realistic WLTP system.

View mpg & specs for any version

Compared to the standard 6-Series, the M6 is pricey when new especially when you consider it’s as expensive as top end Porsche 911s and the Aston Martin V8 Vantage. A new car will still take a sizeable depreciation in in the first 12 months while insurance group 20 and 19mpg add to the costs, but if you have to ask . . .

The M6 returns just 19mpg on average, so it’s no surprise that it scores so lowly on the eco front. With emissions of 362g/km CO2 it scores similarly to other supercars from Aston Martin, Audi and Porsche but fortunately, these sorts of cars tend to be driven less per year than the average family car.

There’s a lot of technology in the M6, as well as a high performance V10 engine, but BMW generally has an impressive record in terms of reliability and durability.