67The Mercedes-Benz G500, a high-performance luxury SUV, has an official combined fuel consumption of around 12.4-13.3 litres per 100 km (approximately 21.2-21.7 mpg). Real-world driving conditions, such as urban traffic or motorway cruising, can push this figure higher—often between 15-18 litres per 100 km (16-19 mpg). The G500’s 4.0-litre V8 biturbo petrol engine delivers strong acceleration (0-62 mph in 5.9 seconds) but prioritises power over efficiency.
For context, the G500’s fuel economy is significantly lower than smaller SUVs like the BMW X5 or hybrid models such as the Lexus RX 450h. Factors like driving style, load, and terrain impact consumption. Owners report higher figures in stop-start city driving, while steady motorway speeds yield slightly better results.
If fuel efficiency is a priority, consider the Mercedes-Benz G350d (diesel variant), which offers better mileage. The G500 suits those prioritising performance and prestige over running costs. Always check the latest WLTP figures for updated data, as emissions regulations and engine tweaks can affect published numbers.

December 5, 2025