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 19 - 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.

Compared with cars of a similar size and with similar power, the SRT-8's list price of around £40,000 seems reasonable. Depreciation will be fairly steep in the first couple of years, and it's in the highest insurance group - 20. It also needs more frequent servicing than other models in the range at every 7500 miles, and its big V8 engine typically delivers about 20mpg.

With its powerful 6.1-litre V8 petrol engine, 300C SRT-8 returns just 20mpg - so it's no surprise that it performs so badly on the eco front. It emits 330g/km CO2, which is high compared to an average family car – but fairly typical of a powerful executive saloon.

The big V8 with its lazy demeanour is unstressed most of the time and should last well. The 300C lacks some of the complex electronic systems found on other large high-performance saloons, which could mean there is less that could go wrong. Frequent services should also find any problems in their early stages.

Ongoing running costs

Road tax (12 months) £580
See tax rates for all versions
Insurance group 46
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