In-depth reviews

Mercedes GLC review - MPG, CO2 and running costs

Standard nine-speed automatic gearbox keeps running costs down and on-par with rivals

As a mid-sized SUV, it shouldn’t come as much of a surprise that the GLC can’t quite match the fuel economy of the C-Class saloon.

Still, the engine improvements introduced for 2019 resulted in small improvements across the board. The latest GLC 220 d delivers between 40.9mpg and 47.9mpg on the WLTP combined cycle, dependent on chosen optional equipment. The GLC 300 d is slightly thirstier, offering 39.2mpg to 44.1mpg. In terms of carbon dioxide emissions, the GLC 220 d manages 156g/km, while the 300 d achieves 176g/km. Both cars see a slight increase in emissions when larger wheels are fitted.

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The petrol GLC 300 returns up to 34.4mpg and has emissions from 187g/km, while the 300e has an all-electric range of around 25-30 miles, which translates to overall economy of 113mpg and 54g/km of CO2.

At the other end of the scale, the AMG GLC 63 S emits 289g/km and returns up to 22.1 mpg, while the GLC 43 manages 236g/km and up to 27.7 mpg.

Servicing and maintenance costs should be on a par with a BMW and Audi, and the fact it shares a number of parts with the C-Class saloon should bring down costs in the long term.

Insurance groups

The insurance groups for the GLC generally range from around group 28 to group 38 for the standard models, depending on engine and trim level. The AMG GLC 43 has a group 40 insurance rating, while the AMG 63 models tops out in group 47. Insuring a premium car such as this could be a big chunk of your annual running costs, and when we tested the previous-gen GLC 250 d AMG Line against a Volvo XC60 D4 R-Design and Audi Q5 2.0 TDI S line, the GLC was the most expensive to insure: our sample driver was quoted at around £1,200, compared to around £850 for the Volvo and Audi.


Premium SUVs are a popular part of the market, and the GLC has reasonable residual values to reflect this. The conventional range sits in the ballpark of around 45%, which is in line with rivals. The GLC Coupe is a stronger performer in the used market, keeping around 50% of its original value over the same period. The AMG models do not hold up so well in percentage terms and, due to their high list prices, will lose the first owner a considerable chunk of money.


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