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

Volvo FM, 405 kW, 6x4 tractor unit vs Volvo FMX, 405 kW, 6x4 tractor unit

Lower declared fuel

Volvo FM, 405 kW, 6x4 tractor unit

2018–2023 · 405 kW
35.3l/100 km
median; across 2 declared configurations

Volvo FMX, 405 kW, 6x4 tractor unit

2021–2023 · 405 kW
39.5l/100 km
median; 35.3–44.5 across 8 declared configurations
Volvo FM, 405 kW, 6x4 tractor unit and Volvo FMX, 405 kW, 6x4 tractor unit side by side
SpecificationVolvo FM, 405 kW, 6x4 tractor unitVolvo FMX, 405 kW, 6x4 tractor unit
Vehicle formTractor unit for semi-trailer (BC)RegisteredTractor unit for semi-trailer (BC)Registered
Axle configuration6×4Declared6×4Declared
Registered new2018–2023Registeredcentral 90% of records2021–2023Registeredcentral 90% of records
Engine power405 kWDeclared405 kWDeclared
Engine displacement12.8 litresDeclared12.8 litresDeclared
GearboxautomatedDeclaredautomatedDeclared
Emission classEURO 6, EURO VI B, EURO VI C, EURO VI ERegisteredNot recorded
Gross vehicle weight29,000–35,000 kgRegisteredmedian 32,000 kg, across 7 type-approval versions and 1 record without one28,500–36,000 kgDeclaredmedian 32,000 kg, across 19 declared configurations
Kerb weight7,570–10,160 kgRegisteredmedian 9,709 kg, over 9 registrationsNot recorded
Wheelbase4,370–4,770 mmRegisteredmedian 4,570 mm, over 9 registrationsNot recorded
Overall length6,740–7,120 mmRegisteredmedian 6,920 mm, over 9 registrationsNot recorded
Overall height2,830–3,790 mmRegisteredmedian 3,540 mm, over 5 registrationsNot recorded
Declared fuel, long haul35.3 l/100 km Declaredmedian; across 2 declared configurations39.5 l/100 km Declaredmedian; 35.3–44.5 l/100 km across 8 declared configurations
CO₂ per tonne-km47.84 g Declaredmedian; 47.84–47.87 g53.5 g Declaredmedian; 47.9–60.3 g

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

What the numbers actually say

The Volvo FM, 405 kW, 6x4 tractor unit declared 4.2 l/100 km less (11.8%) on the long haul at 19.3 t, 2022 declarations. At 120,000 km a year and an assumed £1.40 a litre, that is about 5,040 litres a year, or £7,056. A gap this size is outside the 10% tolerance of declared figures.

FM, 405 kW, 6x4 tractor unit full specificationFMX, 405 kW, 6x4 tractor unit full specification

Fuel over a year

120,000 km · assumed price
Volvo FM, 405 kW, 6x4 tractor unit42,360 litres
£59,304 at the assumed price
Volvo FMX, 405 kW, 6x4 tractor unit47,400 litres
£66,360 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.