Audi A6 RS6 (2008-2010) running costs and reliability

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Running costs rating: 2.5 out of 52.5

Written by David Ross 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 20 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.

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If you’re in the market for a £75,000 high performance saloon or estate then chances are running costs aren’t a huge worry. It’s little surprise that insurance, tax and consumables such as tyres and brake pads are all expensive while fuel economy is poor too and the RS6 will average just 20mpg. In terms of depreciation it will lose about the same amount of money per year as the BMW M5.

It’s little surprise that the 580bhp RS6 is not environmentally-friendly. It emits 331g/km of CO2 (333g/km for the estate) and although that’s slightly less than its main rival the BMW M5, it is still very high. It’s incredibly uneconomical too and will average just 20mpg – although an 80-litre fuel tank means you’ll be able to travel 350 miles before filling up.

Audi has an impressive reputation for reliability and the RS6 will be no different. It may be a high performance car but it’s been extensively engineered and should prove hugely dependable.