In-depth reviews

Mercedes GLS review - MPG, CO2 and running costs

The GLS is a big, heavy car; even with a capable diesel engine it will cost a pretty penny at the pumps

There’s only so much a combustion engine – no matter how efficient – can do to offset the need to haul around a 2.5-tonne SUV. So while the 3.0-litre V6 diesel is a capable unit, at best it achieves 30.7mpg in official WLTP tests. Spend time driving in town and that number is likely to drop quite significantly. Despite the relative thirst, an enormous 90-litre fuel tank means that, should you match the official economy figures, the GLS will cover about 600 miles on a tank.

The Mercedes-AMG GLS 63, trading economy for extra performance, is only able to achieve a maximum 22.1mpg.

Prices for the diesel-powered GLS start from just over £75,000 and climb to around £92,000 before options. You'll need deeper pockets in order to be able to climb into one of the AMG versions, with the top-of-the-range GLS 63 Night Edition Executive version priced at an eye-watering £128,285.

Insurance groups

With such a hefty price tag, insurance costs aren’t likely to be cheap. Groupings for the GLE head right to the top of the 50 classifications available, so a big budget will be needed beyond the initial purchase price.

Depreciation

Depending on the trim level, the GLS is predicted to hold between 43 and 49% of its value over three years and 36,000 miles. That’s some way behind the BMW X7, which retains up to 56% over the same period.

Which Is Best

Cheapest

  • Name
    GLS 400d 4Matic AMG Line Premium 5dr 9G-Tronic
  • Gearbox type
    Semi-auto
  • Price
    £74,465

Most Economical

  • Name
    GLS 400d 4Matic AMG Line Premium 5dr 9G-Tronic
  • Gearbox type
    Semi-auto
  • Price
    £74,465

Fastest

  • Name
    GLS 400d 4Matic AMG Line Premium 5dr 9G-Tronic
  • Gearbox type
    Semi-auto
  • Price
    £74,465

Most Popular

New Audi A6 50 TFSI e 2020 review
Audi A6

New Audi A6 50 TFSI e 2020 review

The new Audi A6 50 TFSI e brings plug-in hybrid power to the A6 range for the first time
10 Nov 2020
New 2021 Mercedes-Maybach S-Class luxury limo unveiled
Mercedes S-Class

New 2021 Mercedes-Maybach S-Class luxury limo unveiled

The new Mercedes-Maybach S-Class has made its official debut, with lashings of technology and even more imposing styling
19 Nov 2020
How to transfer a number plate from one car to another
MINI number plate change
Tips & advice

How to transfer a number plate from one car to another

Need to know how to transfer a number plate between vehicles? Our step-by-step guide breaks it down
22 Nov 2020