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

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

2014–2023 · 375 kW
38.8l/100 km
median; 38.8–40.1 across 2 declared configurations
Mercedes-Benz Arocs, 375 kW, 6x4 tractor unit and Volvo FM, 375 kW, 6x4 tractor unit side by side
SpecificationMercedes-Benz Arocs, 375 kW, 6x4 tractor unitVolvo FM, 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 records2014–2023Registeredcentral 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 ERegisteredEURO V, EURO VI B, EURO VI C, EURO VI D, EURO VI ERegistered
Gross vehicle weight29,000–33,000 kgRegisteredmedian 33,000 kg, across 4 type-approval versions and 2 records without one29,000–35,000 kgRegisteredmedian 32,000 kg, across 7 type-approval versions and 6 records without one
Kerb weight9,704–17,713 kgRegisteredmedian 10,559 kg, over 6 registrations9,372–14,377 kgRegisteredmedian 10,133 kg, over 20 registrations
Wheelbase4,650–5,250 mmRegisteredmedian 4,800 mm, over 6 registrations4,370–4,970 mmRegisteredmedian 4,470 mm, over 20 registrations
Overall length6,900–7,510 mmRegisteredmedian 7,110 mm, over 6 registrations6,780–7,340 mmRegisteredmedian 6,860 mm, over 20 registrations
Overall height3,510 mmRegistered3,020–3,270 mmRegisteredmedian 3,020 mm, over 5 registrations
Declared fuel, long haul39.9 l/100 km Declaredmedian; 37.7–43.1 l/100 km across 18 declared configurations38.8 l/100 km Declaredmedian; 38.8–40.1 l/100 km across 2 declared configurations
CO₂ per tonne-km54.05 g Declaredmedian; 51.09–58.5 g52.59 g Declaredmedian; 52.59–54.3 g

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

What the numbers actually say

There is 1.1 l/100 km between these two (2.8%). 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 1,320 litres a year (£1,848). 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 specificationFM, 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 FM, 375 kW, 6x4 tractor unit46,560 litres
£65,184 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.