Parkers overall rating: 3.5 out of 5 3.5

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

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

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 25 - 42 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.

Most C6 owners buying new will spend more than £30,000 and could spend as much as £38,000. It is unlikely that the C6 will be worth as much as an equivalent BMW 5-series or Mercedes E-Class would be after three years. It’s worth noting however that the C6 is much better equipped than most rivals and that you’d spend a significant sum on options to bring them up to the same level of equipment, much of which would be lost at resale time.

The C6 doesn’t perform too badly on the eco front. The best engine is the 2.2HDi which emits 199g/km of CO2 and returns 43mpg, although the larger 2.7HDi is average, emitting 230g/km of CO2 and with a fuel economy of 33mpg.

An area where Citroën acknowledges it has to improve if it is to be taken seriously in this sector and claims to have done so. The C6 is a very complex vehicle, but the suspension system shouldn’t need maintenance for five years or 125,000 miles. We would be happy to increase this rating as a result of positive feedback from customers.

Ongoing running costs

Road tax (12 months) £265 - £630
See tax rates for all versions
Insurance group 41 - 45
How much is it to insure?