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

Volvo FM, 345 kW, 4x2 tractor unit, 10.8 L (2019–2023) vs Volvo FMX, 345 kW, 4x2 tractor unit, 12.8 L (2021–2023)

Lower declared fuel

Volvo FM, 345 kW, 4x2 tractor unit, 10.8 L (2019–2023)

2019–2023 · 345 kW
30.8l/100 km
median; 28.2–36.9 across 65 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
Volvo FM, 345 kW, 4x2 tractor unit, 10.8 L (2019–2023) and Volvo FMX, 345 kW, 4x2 tractor unit, 12.8 L (2021–2023) side by side
SpecificationVolvo FM, 345 kW, 4x2 tractor unit, 10.8 L (2019–2023)Volvo 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 new2019–2023Registeredcentral 90% of records2021–2023Registeredcentral 90% of records
Engine power345 kWDeclared345 kWDeclared
Engine displacement10.8 litresDeclared12.8 litresDeclared
GearboxautomatedDeclaredautomatedDeclared
Emission classEURO 6, EURO VI D, EURO VI ERegisteredNot recorded
Gross vehicle weight19,100–22,000 kgRegisteredmedian 19,500 kg, across 18 type-approval versions and 3 records without one19,500–23,000 kgDeclaredmedian 21,000 kg, across 58 declared configurations
Kerb weight6,331–7,538 kgRegisteredmedian 6,928 kg, over 36 registrationsNot recorded
Wheelbase3,500–3,810 mmRegisteredmedian 3,800 mm, over 36 registrationsNot recorded
Overall length5,690–5,990 mmRegisteredmedian 5,990 mm, over 36 registrationsNot recorded
Overall height2,890–3,630 mmRegisteredmedian 3,370 mm, over 24 registrationsNot recorded
Declared fuel, long haul30.8 l/100 km Declaredmedian; 28.2–36.9 l/100 km across 65 declared configurations34.4 l/100 km Declaredmedian; 32.4–37.5 l/100 km across 21 declared configurations
CO₂ per tonne-km41.78 g Declaredmedian; 38.3–50.05 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

The Volvo FM, 345 kW, 4x2 tractor unit, 10.8 L (2019–2023) declared 3.6 l/100 km less (11.6%) 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 4,320 litres a year, or £6,048. A gap this size is outside the 10% tolerance of declared figures.

FM, 345 kW, 4x2 tractor unit, 10.8 L (2019–2023) 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
Volvo FM, 345 kW, 4x2 tractor unit, 10.8 L (2019–2023)36,960 litres
£51,744 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.