AllTruckData
Comparison · 6×4 lorry · long haul at 19.3 t

Mercedes-Benz Arocs, 390 kW, 6x4 rigid lorry vs Volvo FMX, 405 kW, 6x4 rigid lorry

Mercedes-Benz Arocs, 390 kW, 6x4 rigid lorry

2021–2023 · 390 kW
42.5l/100 km
median; 35.3–49.2 across 23 declared configurations

Volvo FMX, 405 kW, 6x4 rigid lorry

2021–2023 · 405 kW
39.3l/100 km
median; 36.1–47.7 across 16 declared configurations
Mercedes-Benz Arocs, 390 kW, 6x4 rigid lorry and Volvo FMX, 405 kW, 6x4 rigid lorry side by side
SpecificationMercedes-Benz Arocs, 390 kW, 6x4 rigid lorryVolvo FMX, 405 kW, 6x4 rigid lorry
Vehicle formLorry (BA)RegisteredLorry (BA)Registered
Axle configuration6×4Declared6×4Declared
Registered new2021–2023Registeredcentral 90% of records2021–2023Registeredcentral 90% of records
Engine power390 kWDeclared405 kWDeclared
Engine displacement12.8 litresDeclared12.8 litresDeclared
GearboxautomatedDeclaredautomated, automaticDeclared
Gross vehicle weight26,000–35,800 kgDeclaredmedian 28,000 kg, across 79 declared configurations29,000–40,000 kgDeclaredmedian 33,000 kg, across 53 declared configurations
Declared fuel, long haul42.5 l/100 km Declaredmedian; 35.3–49.2 l/100 km across 23 declared configurations39.3 l/100 km Declaredmedian; 36.1–47.7 l/100 km across 16 declared configurations
CO₂ per tonne-km57.67 g Declaredmedian; 47.92–66.7 g53.3 g Declaredmedian; 48.92–64.71 g

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

What the numbers actually say

There is 3.2 l/100 km between these two (8.1%). 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 13.9 l/100 km across its configurations, so the specification ordered matters more than the choice between these two.

Arocs, 390 kW, 6x4 rigid lorry full specificationFMX, 405 kW, 6x4 rigid lorry full specificationThe fuel ranking

Fuel over a year

120,000 km · assumed price
Mercedes-Benz Arocs, 390 kW, 6x4 rigid lorry51,000 litres
£71,400 at the assumed price
Volvo FMX, 405 kW, 6x4 rigid lorry47,160 litres
£66,024 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.