AllTruckData
Comparison · 8×4 lorry · construction at 12.9 t

Mercedes-Benz Arocs, 425 kW, 8x4 rigid lorry vs Volvo FMX, 405 kW, 8x4 rigid lorry (2021–2023)

Mercedes-Benz Arocs, 425 kW, 8x4 rigid lorry

2017–2023 · 425 kW
47l/100 km
median; 45.2–49.3 across 10 declared configurations

Volvo FMX, 405 kW, 8x4 rigid lorry (2021–2023)

2021–2023 · 405 kW
43.8l/100 km
median; 40.6–48.6 across 30 declared configurations
Mercedes-Benz Arocs, 425 kW, 8x4 rigid lorry and Volvo FMX, 405 kW, 8x4 rigid lorry (2021–2023) side by side
SpecificationMercedes-Benz Arocs, 425 kW, 8x4 rigid lorryVolvo FMX, 405 kW, 8x4 rigid lorry (2021–2023)
Vehicle formLorry (BA)RegisteredLorry (BA)Registered
Axle configuration8×4Declared8×4Declared
Registered new2017–2023Registeredcentral 90% of records2021–2023Registeredcentral 90% of records
Engine power425 kWDeclared405 kWDeclared
Engine displacement15.6 litresDeclared12.8 litresDeclared
GearboxautomatedDeclaredautomatedDeclared
Emission classEURO 6, EURO VI, EURO VI A, EURO VI C, EURO VI D, EURO VI ERegisteredEURO VI ERegistered
Gross vehicle weight32,000–48,000 kgRegisteredmedian 37,000 kg, over 10 registrations44,000 kgRegistered
Kerb weight13,778–30,615 kgRegisteredmedian 18,800 kg, over 10 registrations14,625 kgRegistered
Wheelbase5,630–7,200 mmRegisteredmedian 6,500 mm, over 10 registrations6,450 mmRegistered
Overall length8,700–11,500 mmRegisteredmedian 9,520 mm, over 10 registrations9,220 mmRegistered
Overall height3,650–3,900 mmRegisteredmedian 3,750 mm, over 3 registrations3,200 mmRegistered
Declared fuel, construction47 l/100 km Declaredmedian; 45.2–49.3 l/100 km across 10 declared configurations43.8 l/100 km Declaredmedian; 40.6–48.6 l/100 km across 30 declared configurations
CO₂ per tonne-km95.33 g Declaredmedian; 91.61–100 g88.93 g Declaredmedian; 82.27–98.6 g

Fuel and CO₂: construction at 12.9 t, 2022 declarations.

What the numbers actually say

There is 3.2 l/100 km between these two (7.3%). That is inside the 10% tolerance of declared figures, so on fuel alone neither is the better choice: at 120,000 km a year and an assumed £1.40 a litre the gap would be about 3,840 litres a year (£5,376). The declared figures for one of them alone span 8 l/100 km across its configurations, so the specification ordered matters more than the choice between these two.

Arocs, 425 kW, 8x4 rigid lorry full specificationFMX, 405 kW, 8x4 rigid lorry (2021–2023) full specificationThe fuel ranking

Fuel over a year

120,000 km · assumed price
Mercedes-Benz Arocs, 425 kW, 8x4 rigid lorry56,400 litres
£78,960 at the assumed price
Volvo FMX, 405 kW, 8x4 rigid lorry (2021–2023)52,560 litres
£73,584 at the assumed price
At 120,000 km a year and an assumed £1.40 a litre; the price is an assumption, not one we track.