AllTruckData
Comparison · 4×2 tractor unit · long haul at 19.3 t

Mercedes-Benz Arocs, 350 kW, 4x2 tractor unit vs Volvo FMX, 345 kW, 4x2 tractor unit, 12.8 L (2021–2023)

Mercedes-Benz Arocs, 350 kW, 4x2 tractor unit

2020–2023 · 350 kW
35.6l/100 km
median; 32.1–39.5 across 31 declared configurations

Volvo FMX, 345 kW, 4x2 tractor unit, 12.8 L (2021–2023)

2021–2023 · 345 kW
34.4l/100 km
median; 32.4–37.5 across 21 declared configurations
Mercedes-Benz Arocs, 350 kW, 4x2 tractor unit and Volvo FMX, 345 kW, 4x2 tractor unit, 12.8 L (2021–2023) side by side
SpecificationMercedes-Benz Arocs, 350 kW, 4x2 tractor unitVolvo FMX, 345 kW, 4x2 tractor unit, 12.8 L (2021–2023)
Vehicle formTractor unit for semi-trailer (BC)RegisteredTractor unit for semi-trailer (BC)Registered
Axle configuration4×2Declared4×2Declared
Registered new2020–2023Registeredcentral 90% of records2021–2023Registeredcentral 90% of records
Engine power350 kWDeclared345 kWDeclared
Engine displacement12.8 litresDeclared12.8 litresDeclared
Gearboxautomated, manualDeclaredautomatedDeclared
Gross vehicle weight18,000–20,500 kgDeclaredmedian 18,000 kg, across 114 declared configurations19,500–23,000 kgDeclaredmedian 21,000 kg, across 58 declared configurations
Declared fuel, long haul35.6 l/100 km Declaredmedian; 32.1–39.5 l/100 km across 31 declared configurations34.4 l/100 km Declaredmedian; 32.4–37.5 l/100 km across 21 declared configurations
CO₂ per tonne-km48.2 g Declaredmedian; 43.55–53.6 g46.6 g Declaredmedian; 43.98–50.85 g

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

What the numbers actually say

There is 1.2 l/100 km between these two (3.4%). 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 1,440 litres a year (£2,016). The declared figures for one of them alone span 7.4 l/100 km across its configurations, so the specification ordered matters more than the choice between these two.

Arocs, 350 kW, 4x2 tractor unit full specificationFMX, 345 kW, 4x2 tractor unit, 12.8 L (2021–2023) full specificationThe fuel ranking

Fuel over a year

120,000 km · assumed price
Mercedes-Benz Arocs, 350 kW, 4x2 tractor unit42,720 litres
£59,808 at the assumed price
Volvo FMX, 345 kW, 4x2 tractor unit, 12.8 L (2021–2023)41,280 litres
£57,792 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.