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

Volvo FM, 375 kW, 4x2 tractor unit (2019–2023) vs Volvo FMX, 375 kW, 4x2 tractor unit

Volvo FM, 375 kW, 4x2 tractor unit (2019–2023)

2019–2023 · 375 kW
31.4l/100 km
median; 28.1–39.1 across 68 declared configurations

Volvo FMX, 375 kW, 4x2 tractor unit

2021–2023 · 375 kW
34.3l/100 km
median; 32–40.9 across 24 declared configurations
Volvo FM, 375 kW, 4x2 tractor unit (2019–2023) and Volvo FMX, 375 kW, 4x2 tractor unit side by side
SpecificationVolvo FM, 375 kW, 4x2 tractor unit (2019–2023)Volvo FMX, 375 kW, 4x2 tractor unit
Vehicle formTractor unit for semi-trailer (BC)RegisteredTractor unit for semi-trailer (BC)Registered
Axle configuration4×2Declared4×2Declared
Registered new2019–2023Registeredcentral 90% of records2021–2023Registeredcentral 90% of records
Engine power375 kWDeclared375 kWDeclared
Engine displacement12.8 litresDeclared12.8 litresDeclared
GearboxautomatedDeclaredautomatedDeclared
Emission classEURO 6, EURO VI B, EURO VI C, EURO VI D, EURO VI ERegisteredNot recorded
Gross vehicle weight19,000–23,000 kgRegisteredmedian 21,500 kg, across 14 type-approval versions and 3 records without one20,100–22,000 kgDeclaredmedian 21,000 kg, across 63 declared configurations
Kerb weight7,354–8,320 kgRegisteredmedian 7,523 kg, over 18 registrationsNot recorded
Wheelbase3,700–3,900 mmRegisteredmedian 3,800 mm, over 18 registrationsNot recorded
Overall length5,890–6,210 mmRegisteredmedian 5,990 mm, over 18 registrationsNot recorded
Overall height3,400–3,780 mmRegisteredmedian 3,430 mm, over 3 registrationsNot recorded
Declared fuel, long haul31.4 l/100 km Declaredmedian; 28.1–39.1 l/100 km across 68 declared configurations34.3 l/100 km Declaredmedian; 32–40.9 l/100 km across 24 declared configurations
CO₂ per tonne-km42.54 g Declaredmedian; 38.1–53.02 g46.55 g Declaredmedian; 43.34–55.4 g

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

What the numbers actually say

There is 2.9 l/100 km between these two (9.2%). 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 3,480 litres a year (£4,872). The declared figures for one of them alone span 11 l/100 km across its configurations, so the specification ordered matters more than the choice between these two.

FM, 375 kW, 4x2 tractor unit (2019–2023) full specificationFMX, 375 kW, 4x2 tractor unit full specificationThe fuel ranking

Fuel over a year

120,000 km · assumed price
Volvo FM, 375 kW, 4x2 tractor unit (2019–2023)37,680 litres
£52,752 at the assumed price
Volvo FMX, 375 kW, 4x2 tractor unit41,160 litres
£57,624 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.