Mercedes C-Class Coupe review - MPG, CO2 and Running Costs

Diesel models appeal to the head while petrol powered versions of the C-Class Coupe appeal to the heart

If the idea of having a diesel engine powering your sleek two-door Mercedes coupe revolts you then you’ll be drawn to the petrol alternatives. If you’re after the cheapest to run petrol then the C 200 will impress – its 181bhp 2.0-litre petrol will return 53.3mpg and emissions of 123g/km of CO2. 

Meanwhile the more powerful 2.0-litre petrol – in the C 300 with 241bhp – returns 44.8mpg and emits 146g/km with 17-inch wheels. With 18- and 19-inch wheels, its emissions jump giving a higher company car tax penalty.

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Naturally, the AMG models are more costly to run. The C 43 will return a reasonable 36.2mpg and emits 178g/km of CO2. Mercedes claims 32.8mpg for the C63 models but you’re unlikely to achieve much more than 25mpg. CO2 emissions are 200g/km.

If you’re going to be running a C-Class Coupe as a company car or would just rather get more miles for your money, then the two diesel versions will appeal. The C 220d powered by a 167bhp 2.1-litre diesel is the most frugal and tax friendly with a claimed combined MPG of 68.9, but the C 250d (which comes with 201bhp 2.1-litre diesel) isn’t noticeably worse at 67.3mpg. 

CO2 emissions vary according to wheel size for most C-Class Coupe models but this is particularly so with the diesel versions. Sport models with 17-inch wheels result in CO2 emissions of 106g/km for the C 220d and 109g/km for the C 250d. Larger 18- and 19-inch alloy wheels push up the price up, but it’ll be small extra outlay for the extra style, most buyers will conclude. 

Insurance groups 

The words ‘Mercedes’ and ‘Coupe’ normally set insurance firms on edge, more so than the saloon versions. Insurance groups kick off from the low 30s for the diesel and 2.0-litre petrols. The C 43 comes in at 45 while the C 63 versions are rated between 47 and 50.


The C-Class has good residuals for the mid-size coupe market – private buyers should expect around 44 per cent when it comes to part-exchange, making the Mercedes one of the best in the class for retained value. AS an example, the C 250 d AMG Line costs £365 more than an Audi A5 2.0 TDI S line S tronic to buy, but won’t hold its value as well. It’ll lose £21,396 (55.6 per cent) compared with a more manageable but still fairly steep £19,279 (50.6 per cent) over three years for the A5.

As with the C-Class Saloon, it’s recommended to go for some of the options packs to boost residual values such as the Premium and Premium Plus packs. Also the diesel models enjoy stronger residuals than the petrol-powered versions. 


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