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Monthly cost of ownership data provided exclusively for The Car Expert by Clear Vehicle Data

Fuel consumption Average Score Variation Score
Petrol models 35 mpg D 32 – 38 mpg D – E
Diesel models 47 mpg C 40 – 52 mpg B – D
Plug-in hybrid models 381 mpg A 109 – 706 mpg A – A
CO₂ output Average Score Variation Score
Petrol models 185 g/km C 171 – 200 g/km C – D
Diesel models 161 g/km C 141 – 183 g/km B – C
Plug-in hybrid models 33 g/km A 10 – 58 g/km A – A
Battery range Average Score Variation Score
Plug-in hybrid models 56 miles C 27 – 83 miles C – E
Insurance group Average Score Variation Score
All models 45 D 32 – 50 C – F
Service and maintenance Cost Score
Year 1 £422 D
Year 2 £1,072 D
Year 3 £1,742 D
Year 4 £2,096 D
Year 5 £2,888 D
Overall £8,220 D

The Mercedes-Benz GLC is an expensive car to run, according to numbers provided exclusively to The Car Expert by our data partner, Clear Vehicle Data.

Fuel consumption is disappointingly poor for petrol models, and only average for diesels. The plug-in hybrid stats look good on paper, but this is largely a function of misleading EU/UK government lab tests that make every plug-in hybrid look amazing. There are no real-world situations where you’re going to get 381 miles out of a single gallon (4.5 litres) of fuel and a bit of electricity.

Battery range on the plug-in hybrid is quite good, with an official range of 56 miles – although this depends on which model you choose. If you are able to charge the GLC every day, you may well be able to do all of your day-to-day driving purely on electrical power. On longer trips, you’ll still probably run out of charge fairly quickly.

Insurance and scheduled servicing costs for the GLC are likely to be high, especially compared to similarly-sized cars from other brands.

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