In-depth reviews

Mercedes GLB review - MPG, CO2 & running costs

Excellent fuel economy from the diesel engines, while a GLB electrified version is set to offer even greater efficiency and savings

Overall Auto Express Rating

4.0 out of 5

MPG, CO2 and running costs Rating

4.0 out of 5

  • Seven-seat practicality
  • Efficient engines
  • Impressive tech
  • Dull to drive
  • Small boot in seven-seat mode
  • Can get expensive

The Mercedes-Benz GLB is impressively economical, thanks to a range of efficient four-cylinder engines. The GLB 200 d is especially frugal, achieving 49.6mpg on a combined cycle, with CO2 emissions of 148-149g/km. The 4Matic versions are slightly less efficient, with figures of 47.9mpg and 154-155g/km.

The GLB 200 d 4Matic should return 47.1mpg to 47.9mpg, with CO2 emissions of 155-157g/km. Thanks to fuel economy of 39.2mpg and CO2 emissions of 163g/km, the GLB 200 petrol is ideal for town drivers and city commuters.

Predictably, the Mercedes-AMG GLB 35 is the least economical, although 32.1mpg is respectable for a performance version.

Most versions of the GLB are expensive enough to attract the premium rate of Vehicle Excise Duty (VED). It means that cars with a list price of more than £40,000 are charged £475 a year from year two. Only the AMG Line models and GLB 200 AMG Line Premium slip below the £40,000 mark, so pay the lower rate of £150 from year two.

Insurance groups

Insurance premium costs are reasonable for a car of this size, especially if you opt for the GLB 200, which ranges from group 27 to group 29. The GLB 200 d will be slightly more expensive to insure, ranging from group 29 to group 30.

The more powerful GLB 220 d slots into groups 35 and 36, while the AMG version gets a group rating of 41. Crucially, the GLB should be less expensive to insure than the GLC, which ranges from group 32 to 44.


Premium SUVs remain very popular, so the GLB should have reasonable residual values. There are a number of factors working in its favour, including the efficient engines, seven-seat practicality and family-friendly practicality. The AMG-Line model is likely to retain more of its value than the Mercedes-AMG GLB 35.

Most Popular

New Vauxhall Crossland Griffin arrives to boost SUV’s appeal
Vauxhall Crossland Griffin
Vauxhall Crossland

New Vauxhall Crossland Griffin arrives to boost SUV’s appeal

The new Vauxhall Crossland Griffin undercuts the SE on price, but adds more equipment
26 Jul 2021
New 2021 Kia EV6 boasts up to 328 miles of range
Kia EV6 - front
Kia EV6

New 2021 Kia EV6 boasts up to 328 miles of range

Kia reveals more specs for its bespoke electric car, with the EV6 offering long range and an 18-minute 80 per cent rapid recharge time
21 Jul 2021
New 2021 Audi RS 3: 395bhp mega hatch priced from £50,900
Audi RS 3 Sportback - front
Audi RS3

New 2021 Audi RS 3: 395bhp mega hatch priced from £50,900

Full exterior and interior reveal for Audi RS 3, with aggressive styling and racy cabin to match strong performance
19 Jul 2021