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

Mercedes-Benz Arocs, 390 kW, 6x4 tractor unit vs Renault T, 390 kW, 6x4 tractor unit

Mercedes-Benz Arocs, 390 kW, 6x4 tractor unit

2018–2023 · 390 kW

40.1l/100 km

median; 35.5–45.2 across 30 declared configurations

Renault T, 390 kW, 6x4 tractor unit

2019–2023 · 390 kW

39.1l/100 km

median; 34.1–42 across 28 declared configurations

Mercedes-Benz Arocs, 390 kW, 6x4 tractor unit and Renault T, 390 kW, 6x4 tractor unit side by side
Specification	Mercedes-Benz Arocs, 390 kW, 6x4 tractor unit	Renault T, 390 kW, 6x4 tractor unit
Vehicle form	Tractor unit for semi-trailer (BC)Registered	Tractor unit for semi-trailer (BC)Registered
Axle configuration	6×4Declared	6×4Declared
Registered new	2018–2023Registeredcentral 90% of records	2019–2023Registeredcentral 90% of records
Engine power	390 kWDeclared	390 kWDeclared
Engine displacement	12.8 litresDeclared	12.8 litresDeclared
Gearbox	automated, manualDeclared	automatedDeclared
Emission class	EURO VIRegistered	Not recorded
Gross vehicle weight	33,000 kgRegistered	28,500–35,000 kgDeclaredmedian 30,000 kg, across 90 declared configurations
Kerb weight	10,287–10,351 kgRegisteredmedian 10,340 kg, over 9 registrations	Not recorded
Wheelbase	4,800 mmRegistered	Not recorded
Overall length	7,060 mmRegistered	Not recorded
Declared fuel, long haul	40.1 l/100 km Declaredmedian; 35.5–45.2 l/100 km across 30 declared configurations	39.1 l/100 km Declaredmedian; 34.1–42 l/100 km across 28 declared configurations
CO₂ per tonne-km	54.32 g Declaredmedian; 48.18–61.22 g	53.05 g Declaredmedian; 46.27–56.89 g

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

What the numbers actually say

There is 1 l/100 km between these two (2.5%). 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 1,200 litres a year (£1,680). The declared figures for one of them alone span 9.7 l/100 km across its configurations, so the specification ordered matters more than the choice between these two.

Arocs, 390 kW, 6x4 tractor unit full specification T, 390 kW, 6x4 tractor unit full specification The fuel ranking

Fuel over a year

120,000 km · assumed price

Mercedes-Benz Arocs, 390 kW, 6x4 tractor unit48,120 litres

£67,368 at the assumed price

Renault T, 390 kW, 6x4 tractor unit46,920 litres

£65,688 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.