Parkers overall rating: 3.5 out of 5 3.5

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

Petrol engines 3.8 - 5.7 mpp
Diesel engines 5.7 - 7.5 mpp
Plug-in hybrid petrol engines 16.9 - 18.1 mpp
Plug-in hybrid diesel engines 22.9 - 25.4 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 21.9 - 32.8 mpg
Diesel engines 33.6 - 44.1 mpg
Plug-in hybrid petrol engines 97.4 - 104.6 mpg
Plug-in hybrid diesel engines 134.5 - 148.7 mpg
  • Good fuel economy from all-non AMG models
  • Low CO2 from diesel and PHEV models
  • Best not talk about the GLC 43, 63 and 63 S

The GLC Coupe's four-cylinder engines are a recent addition to the range and that's reflected in their competitive fuel economy. The 220 d is the most efficient and it makes 40.9mpg combined on the WLTP 'real world' test, and emits from 137g/km of CO2. The 300 d can't quite match that, with 39.2mpg and 157g/km, expect it to be much closer to the 220 d in real life.

New for 2020 is the plug-in hybrid 300 e which significantly widens the appeal of the GLC Coupe. The headline news is a battery-only range of up to 27 miles and a claimed Combined 117.7mpg on the WLTP real-world fuel consumption test.

The more powerful AMG GLC 63 and GLC 63 S models are going to be costly and not particularly green. Economy of more than 20mpg on A-roads and motorways could be possible driven gently, but given how fun these cars are to drive, some owners may achieve far less than this.

Are they green?

These are big SUVs, so don't expect miracles. However, the GLC Coupe 220 d puts in a good performance, and it puts out lower CO2 emissions lower than the BMW X3 or Audi Q5. The 137g/km figure isn't bad at all, and that makes it cheaper to tax than its two main premium rivals. For bigger wheels or other choice optional extras, though, and this figure will increase.

As with fuel economy, expect impressively high levels of CO2 to be produced by AMG models. The pre-facelift cars produced in excess of 270g/km, and we wouldn’t expect this to reduce post-facelift.

2019 Mercedes-Benz GLC wheel

Mercedes-Benz GLC Coupe reliability

Mercedes-Benz has a good reputation for reliability and quality, but perception might not reflect reality. In the 2019 JD Power UK Vehicle Dependency survey, it came fifth from bottom, finding itself ahead of just Jaguar Land Rover, Audi, Fiat and BMW.

The GLC Coupe’s SUV sister car has a number of recalls posted against it. In 2018, there were eight relating to everything from front seat belt tensioners not functioning to inadequate bonding of the windscreen. Said issues were all fixed under warranty by Mercedes-Benz.

But in terms of tried and tested tech, the GLC Coupe shouldn't be any better or worse than any other Mercedes-Benz. The interior is shared with the C-Class, so not only is it attractively designed, but it feels solid to the touch.

Mercedes-Benz GLC Coupe (2020) boot badge

Ongoing running costs

Road tax (12 months) £155 - £490
See tax rates for all versions
Insurance group 29 - 49
How much is it to insure?