AllTruckData
Comparison · 4×2 lorry · long haul at 14 t

Volvo FM, 345 kW, 4x2 rigid lorry, 12.8 L (2019–2023) vs Volvo FMX, 345 kW, 4x2 rigid lorry, 12.8 L (2021–2023)

Volvo FM, 345 kW, 4x2 rigid lorry, 12.8 L (2019–2023)

2019–2023 · 345 kW
32.2l/100 km
median; 28.9–44.4 across 19 declared configurations

Volvo FMX, 345 kW, 4x2 rigid lorry, 12.8 L (2021–2023)

2021–2023 · 345 kW
32.8l/100 km
median; 30.3–37.2 across 11 declared configurations
Volvo FM, 345 kW, 4x2 rigid lorry, 12.8 L (2019–2023) and Volvo FMX, 345 kW, 4x2 rigid lorry, 12.8 L (2021–2023) side by side
SpecificationVolvo FM, 345 kW, 4x2 rigid lorry, 12.8 L (2019–2023)Volvo FMX, 345 kW, 4x2 rigid lorry, 12.8 L (2021–2023)
Vehicle formLorry (BA)RegisteredLorry (BA)Registered
Axle configuration4×2Declared4×2Declared
Registered new2019–2023Registeredcentral 90% of records2021–2023Registeredcentral 90% of records
Engine power345 kWDeclared345 kWDeclared
Engine displacement12.8 litresDeclared12.8 litresDeclared
Gearboxautomated, automaticDeclaredautomatedDeclared
Gross vehicle weight19,000–23,000 kgDeclaredmedian 21,000 kg, across 129 declared configurations21,000–23,000 kgDeclaredmedian 22,000 kg, across 25 declared configurations
Declared fuel, long haul32.2 l/100 km Declaredmedian; 28.9–44.4 l/100 km across 19 declared configurations32.8 l/100 km Declaredmedian; 30.3–37.2 l/100 km across 11 declared configurations
CO₂ per tonne-km60.2 g Declaredmedian; 53.93–82.93 g61.3 g Declaredmedian; 56.7–69.59 g

Fuel and CO₂: long haul at 14 t, 2022 declarations.

What the numbers actually say

There is 0.6 l/100 km between these two (1.8%). 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 720 litres a year (£1,008). The declared figures for one of them alone span 15.5 l/100 km across its configurations, so the specification ordered matters more than the choice between these two.

FM, 345 kW, 4x2 rigid lorry, 12.8 L (2019–2023) full specificationFMX, 345 kW, 4x2 rigid lorry, 12.8 L (2021–2023) full specificationThe fuel ranking

Fuel over a year

120,000 km · assumed price
Volvo FM, 345 kW, 4x2 rigid lorry, 12.8 L (2019–2023)38,640 litres
£54,096 at the assumed price
Volvo FMX, 345 kW, 4x2 rigid lorry, 12.8 L (2021–2023)39,360 litres
£55,104 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.