In-depth reviews

Mercedes C-Class review - MPG, CO2 and running costs

Economy is strong compared to rivals, with new mild-hybrid petrol model designed for fuel-free coasting

The entry C 180 is equipped with a manual gearbox, with Mercedes claiming 43.5mpg on a combined run, with CO2 emissions of 151g/km. The C 200 auto achieves 44.1mpg, with emissions of 158g/km. The C 300 doesn’t take too hard an economy hit, delivering 40.4mpg. However, exhaust emissions are high at up to 162g/km, depending on which wheel size you choose,.

The C 220 d diesel gets a combined figure of 55.4mpg with 133g/km in its cleanest spec. A best combined figure of 49.6mpg is quoted for the C 300 d, with emissions of 145g/km.

There’s little between the AMG models from a running costs perspective – Mercedes claims 28.8mpg for the six-cylinder C 43 saloon and 25.5mpg for the eight-cylinder 63 S badged models, with 219g/km and 250g/km CO2 emissions, respectively.

The most economical models by far are the two plug-in hybrids. The diesel-hybrid C 300 de claims to have economy figures of up to 217.3mpg and emissions ratings of 32g/km of CO2, while the C 300 e returns a claimed best of 176.6mpg combined along with 33g/km of CO2.

All powertrains take a slight economy and emissions knock if you opt for the estate body, given the extra weight of the more practical rear end. The coupe’s figures are remarkably close to those quoted for the saloon. Like the estate, the heavier cabriolet model is not quite as frugal or clean. 

Insurance groups

Entry-level models such as the C 180 and C 200 equipped with manual gearboxes occupy groups in the low 20s depending on your final specification, with the volume sellers – the C 220 d diesel and C 200 petrol – hovering around the group 30 mark.

Depreciation

Our latest data suggests that the C-Class is no longer quite the value holder it once was, with the true volume sellers – the C 220 d and C 200 saloons – likely to hold on to between 36-42% of their value over three years and 36,000 miles, depending on what specification you opt for.

Generally, the three other body styles the C-Class is offered in fare better, with coupe and cabriolet variants expected to hold on to their value the best. For example, a C 200 AMG Line Coupe is predicted to retain 50% of its value over three years.

Which Is Best

Cheapest

  • Name
    C180 S 4dr
  • Gearbox type
    Manual
  • Price
    £28,035

Most Economical

  • Name
    C300e Sport Edition 4dr 9G-Tronic
  • Gearbox type
    Semi-auto
  • Price
    £40,074

Fastest

  • Name
    C300e Sport Edition 4dr 9G-Tronic
  • Gearbox type
    Semi-auto
  • Price
    £40,074

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