AllTruckData
Comparison · 6×4 tractor unit · long haul at 19.3 t

Mercedes-Benz Arocs, 375 kW, 6x4 tractor unit vs Volvo FMX, 375 kW, 6x4 tractor unit

Mercedes-Benz Arocs, 375 kW, 6x4 tractor unit

2015–2023 · 375 kW
39.9l/100 km
median; 37.7–43.1 across 18 declared configurations

Volvo FMX, 375 kW, 6x4 tractor unit

2021–2023 · 375 kW
39.6l/100 km
median; 37.9–42.9 across 4 declared configurations
Mercedes-Benz Arocs, 375 kW, 6x4 tractor unit and Volvo FMX, 375 kW, 6x4 tractor unit side by side
SpecificationMercedes-Benz Arocs, 375 kW, 6x4 tractor unitVolvo FMX, 375 kW, 6x4 tractor unit
Vehicle formTractor unit for semi-trailer (BC)RegisteredTractor unit for semi-trailer (BC)Registered
Axle configuration6×4Declared6×4Declared
Registered new2015–2023Registeredcentral 90% of records2021–2023Registeredcentral 90% of records
Engine power375 kWDeclared375 kWDeclared
Engine displacement12.8 litresDeclared12.8 litresDeclared
GearboxautomatedDeclaredautomatedDeclared
Emission classEURO VI, EURO VI A, EURO VI D, EURO VI ERegisteredNot recorded
Gross vehicle weight29,000–33,000 kgRegisteredmedian 33,000 kg, across 4 type-approval versions and 2 records without one29,000–36,000 kgDeclaredmedian 32,000 kg, across 18 declared configurations
Kerb weight9,704–17,713 kgRegisteredmedian 10,559 kg, over 6 registrationsNot recorded
Wheelbase4,650–5,250 mmRegisteredmedian 4,800 mm, over 6 registrationsNot recorded
Overall length6,900–7,510 mmRegisteredmedian 7,110 mm, over 6 registrationsNot recorded
Overall height3,510 mmRegisteredNot recorded
Declared fuel, long haul39.9 l/100 km Declaredmedian; 37.7–43.1 l/100 km across 18 declared configurations39.6 l/100 km Declaredmedian; 37.9–42.9 l/100 km across 4 declared configurations
CO₂ per tonne-km54.05 g Declaredmedian; 51.09–58.5 g53.72 g Declaredmedian; 51.44–58.2 g

Fuel and CO₂: long haul at 19.3 t, 2022 declarations.

What the numbers actually say

There is 0.3 l/100 km between these two (0.7%). 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 360 litres a year (£504). The declared figures for one of them alone span 5.4 l/100 km across its configurations, so the specification ordered matters more than the choice between these two.

Arocs, 375 kW, 6x4 tractor unit full specificationFMX, 375 kW, 6x4 tractor unit full specificationThe fuel ranking

Fuel over a year

120,000 km · assumed price
Mercedes-Benz Arocs, 375 kW, 6x4 tractor unit47,880 litres
£67,032 at the assumed price
Volvo FMX, 375 kW, 6x4 tractor unit47,520 litres
£66,528 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.