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

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

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

2021–2023 · 345 kW
36l/100 km
median; 34.7–37.8 across 5 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 FMX, 345 kW, 4x2 tractor unit, 10.8 L (2021–2023) and Volvo FMX, 345 kW, 4x2 tractor unit, 12.8 L (2021–2023) side by side
SpecificationVolvo FMX, 345 kW, 4x2 tractor unit, 10.8 L (2021–2023)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 new2021–2023Registeredcentral 90% of records2021–2023Registeredcentral 90% of records
Engine power345 kWDeclared345 kWDeclared
Engine displacement10.8 litresDeclared12.8 litresDeclared
GearboxautomatedDeclaredautomatedDeclared
Gross vehicle weight21,000–22,000 kgDeclaredmedian 21,000 kg, across 7 declared configurations19,500–23,000 kgDeclaredmedian 21,000 kg, across 58 declared configurations
Declared fuel, long haul36 l/100 km Declaredmedian; 34.7–37.8 l/100 km across 5 declared configurations34.4 l/100 km Declaredmedian; 32.4–37.5 l/100 km across 21 declared configurations
CO₂ per tonne-km48.75 g Declaredmedian; 47.08–51.2 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

There is 1.6 l/100 km between these two (4.6%). 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 1,920 litres a year (£2,688). The declared figures for one of them alone span 5.1 l/100 km across its configurations, so the specification ordered matters more than the choice between these two.

FMX, 345 kW, 4x2 tractor unit, 10.8 L (2021–2023) 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 FMX, 345 kW, 4x2 tractor unit, 10.8 L (2021–2023)43,200 litres
£60,480 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.