Mercedes-Benz G-Class reliability, MPG and running costs
Figures updated
The Mercedes-Benz G-Class is a car. In 2024 MOT tests it scored 147 for reliability (100 is average), ranking 65 of 442, and 12.1% failed first time against a UK average of 28.5%. Its most common MOT failure is condition (1.6% of tests).
Ranked 65 of 442 cars in the 2024 MOT Reliability League
In 2024, 2,681 Mercedes-Benz G-Classes aged 3 to 20 had an MOT and 12.1% failed first time (UK average 28.5%). Taking age and mileage into account, the Mercedes-Benz G-Class is 32% less likely to fail than the average car of the same age and mileage. At the first MOT, at three years old, 9.4% failed (UK 12.7%).
First-time fail rate
12.1%
UK 28.5%
Fail rate at 3 years
9.4%
UK 12.7%
Average miles a year
7,500
Typical age at test: 5 years
Mercedes-Benz G-Class MOT failure rate by age
Most common Mercedes-Benz G-Class MOT faults
- Condition: has a cut in excess of the requirements deep enough to reach the ply or cords1.6% of tests
- Registration plates: does not conform to the specified requirements1.2% of tests
- Malfunction indicator lamp: inoperative or indicates a malfunction1.0% of tests
- Coil spring: fractured or broken1.0% of tests
- Condition: has ply or cords exposed0.8% of tests
- Tread depth: tread depth below requirements of 1.6mm0.8% of tests
What the Mercedes-Benz G-Class fails on
| Area | Tests failing | vs similar cars |
|---|---|---|
| Tyres | 3.8% | ▼ 30% less often |
| Lights and electrics | 3.3% | ▼ 33% less often |
| Brakes | 2.2% | ▼ 36% less often |
| Suspension | 1.6% | ▼ 52% less often |
| Exhaust and emissions | 1.3% | About average |
| Visibility | 1.2% | ▼ 65% less often |
| Steering | 0.8% | About average |
| Seat belts and airbags | 0.5% | ▲ 1.3× as often |
| Body and structure | 0.4% | ▼ 62% less often |
| Wheels | 0.1% | ▼ 49% less often |
What MPG does the Mercedes-Benz G-Class do?
Official economy for the Mercedes-Benz G-Class ranges from 14.1 to 32.5mpg across the 24 versions listed by the Vehicle Certification Agency (2012–2025). A typical petrol version manages 20.5mpg and a typical diesel 25.7mpg. Electric versions average 2 miles per kWh, with an official range of 270 to 294 miles. Expect 10–15% less in real-world driving.
Work out a journey's fuel costHow much is road tax on a Mercedes-Benz G-Class?
Any Mercedes-Benz G-Class first registered from April 2017 pays the standard rate of £200 a year after its first year (2026/27 rates). A Mercedes-Benz G-Class registered between March 2001 and March 2017 is taxed on its CO2: £790 a year.
Work out tax for a specific carMercedes-Benz G-Class specs and running costs
Official figures for 24 versions sold in the UK between 2012 and 2025.
Fuel types
Diesel, Electric, Petrol
Official economy
14.1–32.5 mpg
Electric range
270–294 miles
Efficiency
2.0 mi/kWh
CO2
77–456 g/km
Power
330–587 PS
| Version | Fuel | Economy | CO2 | Car tax | Company car tax |
|---|---|---|---|---|---|
| G-Class G 450 d367 PS · A9 · listed 2025 | Diesel | 32.5 mpg | 227g | £200 | 37% |
| G-Class G 580587 PS · N/A · listed 2025 | Electric | 2 mi/kWh | 0g | £200 | 4% |
| G-Class G 500449 PS · A9 · listed 2025 | Petrol | 25.7 mpg | 249g | £200 | 37% |
| G-Class AMG G 63585 PS · A9 · listed 2025 | Petrol | 19.2 mpg | 335g | £200 | 37% |
| G-Class G 580 with EQ Technology432 PS · N/A · listed 2024 | Electric | 2 mi/kWh | 0g | £200 | 4% |
| G-Class Mercedes-AMG G 63585 PS · A9 · listed 2024 | Petrol | 19.2 mpg | 335g | £200 | 37% |
| G-Class G 400 d330 PS · A9 · listed 2023 | Diesel | 25.9 mpg | 286g | £200 | 37% |
| G-Class Mercedes-AMG G 63 4x4²585 PS · A9 · listed 2023 | Petrol | 14.1 mpg | 456g | £200 | 37% |
| G-Class MY 201.5 G 400 d330 PS · A9 · listed 2021 | Diesel | 25.7 mpg | 288g | £200 | – |
| G-Class MY 201.5 AMG G 63585 PS · A9 · listed 2021 | Petrol | 17.2 mpg | 77g | £200 | – |
| G-Class G 350 d with 18'' rear wheelsA7 · listed 2018 | Diesel | 28.5 mpg | 261g | £200 | – |
| G-Class G 350 d with 19'' rear wheelsA7 · listed 2018 | Diesel | 28.5 mpg | 261g | £200 | – |
| G-Class AMG G 63 with 20'' rear wheelsA7 · listed 2018 | Petrol | 20.5 mpg | 322g | £200 | – |
| G-Class AMG G 63 with 21'' rear wheelsA7 · listed 2018 | Petrol | 20.5 mpg | 322g | £200 | – |
| G-Class AMG G 63 4MATIC with 20'' rear wheelsA9 · listed 2018 | Petrol | 21.6 mpg | 299g | £200 | – |
Economy and CO2 are official NEDC (before 2018) or WLTP figures. Car tax is the yearly rate at current rates for a car first registered in the year listed, before any expensive car supplement. Company car tax is the 2026/27 benefit-in-kind rate. Showing the 15 most recent of 24 versions.
What a Mercedes-Benz G-Class costs to fuel
- petrol, typical official 20.5mpg…
- diesel, typical official 25.7mpg…
- Electric, typical official 2 miles per kWh…
Official figures are usually 10–15% better than real-world driving.
Work out your charging costsWork out a journey in a Mercedes-Benz G-ClassBuying a used Mercedes-Benz G-Class?
Check the MOT history of the exact car: every result, advisory and mileage reading, free.
Other Mercedes-Benz models
Frequently asked questions
›Is the Mercedes-Benz G-Class reliable?
Its MOT record is better than average: the Mercedes-Benz G-Class is 32% less likely to fail than the average car of the same age and mileage, with a reliability score of 147 in our 2024 league (100 is average).
›What are common problems with the Mercedes-Benz G-Class?
The most common MOT fault is “Condition: has a cut in excess of the requirements deep enough to reach the ply or cords”, found in 1.6% of tests.
›What MPG does the Mercedes-Benz G-Class do?
Official economy for the Mercedes-Benz G-Class ranges from 14.1 to 32.5mpg across the 24 versions listed by the Vehicle Certification Agency (2012–2025). A typical petrol version manages 20.5mpg and a typical diesel 25.7mpg. Electric versions average 2 miles per kWh, with an official range of 270 to 294 miles. Expect 10–15% less in real-world driving.
›How much is road tax on a Mercedes-Benz G-Class?
Any Mercedes-Benz G-Class first registered from April 2017 pays the standard rate of £200 a year after its first year (2026/27 rates). A Mercedes-Benz G-Class registered between March 2001 and March 2017 is taxed on its CO2: £790 a year.
›How many Mercedes-Benz G-Classes fail their MOT?
12.1% of Mercedes-Benz G-Classes aged 3 to 20 failed their MOT first time in 2024, and 9.4% failed at their first MOT.
Sources: DVSA anonymised MOT tests 2024, all versions of the Mercedes-Benz G-Class combined (Open Government Licence v3.0); official economy and CO2 from Vehicle Certification Agency data, © Crown copyright. VCA cannot accept liability for its accuracy. How we calculate the league.