Parkers overall rating: 3.9 out of 5 3.9

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

Petrol engines 5.4 - 5.9 mpp
Diesel engines 6.6 - 7.6 mpp
Plug-in hybrid petrol engines 62.8 mpp
Low figures relate to the least economical version; high to the most economical. Based on WLTP combined fuel economy for versions of this car made since September 2017 only, and typical current fuel or electricity costs.
Based on "Weighted" mpg; figures depend on the proportion of miles driven in pure electric mode and may vary widely

Fuel economy

Petrol engines 40.4 - 44.1 mpg
Diesel engines 53.3 - 61.4 mpg
Plug-in hybrid petrol engines 470.8 mpg
  • Diesel is the economy king
  • Petrols still make a lot of sense
  • Plug-in hybrid coming soon

How much does it cost to run?

So far there are only petrols and diesels on offer.  But there is a plug-in hybrid en route.

Diesels look like the sensible option and fit with the long-legged nature of the car. Although the petrols are usefully cheaper to buy.

All models come with mild hybrid systems to boost economy.

MPG and CO2

Figures for fuel economy and CO2 emissions are as follows under the latest WLTP regime:

  • C220d: 58.9-61.4mpg, 120-127g/km
  • C300d: 53.3-55.4mpg, 133-139g/km
  • C200: 41.5-44.1mpg, 146-154g/km
  • C300: 40.4-42.2mpg, 152-159g/km

On a 200-mile motorway schlep, we managed 60mpg from the C220d, which is absolutely spot on. From a 66-litre tank most people should expect a 600-mile range from this engine.

In town, it’s not quite as economical. But that is usual for petrol and diesel engines.


This C-Class hasn’t been out for long enough to make much of its reliability. But it comes with a three-year unlimited mileage warranty and is also covered by Mercedes-Benz Roadside Assistance.

Ongoing running costs

Road tax (12 months) £165 - £520
Insurance group 38 - 47
How much is it to insure?