AllTruckData
Comparison · 6×4 lorry · long haul at 19.3 t

Volvo FM, 345 kW, 6x4 rigid lorry, 12.8 L (2020–2023) vs Volvo FMX, 345 kW, 6x4 rigid lorry, 10.8 L (2021–2023)

Volvo FM, 345 kW, 6x4 rigid lorry, 12.8 L (2020–2023)

2020–2023 · 345 kW
38.4l/100 km
median; 34.2–40.6 across 14 declared configurations

Volvo FMX, 345 kW, 6x4 rigid lorry, 10.8 L (2021–2023)

2021–2023 · 345 kW
36.5l/100 km
median; 35.4–39.6 across 9 declared configurations
Volvo FM, 345 kW, 6x4 rigid lorry, 12.8 L (2020–2023) and Volvo FMX, 345 kW, 6x4 rigid lorry, 10.8 L (2021–2023) side by side
SpecificationVolvo FM, 345 kW, 6x4 rigid lorry, 12.8 L (2020–2023)Volvo FMX, 345 kW, 6x4 rigid lorry, 10.8 L (2021–2023)
Vehicle formLorry (BA)RegisteredLorry (BA)Registered
Axle configuration6×4Declared6×4Declared
Registered new2020–2023Registeredcentral 90% of records2021–2023Registeredcentral 90% of records
Engine power345 kWDeclared345 kWDeclared
Engine displacement12.8 litresDeclared10.8 litresDeclared
Gearboxautomated, automaticDeclaredautomatedDeclared
Gross vehicle weight29,000–36,000 kgDeclaredmedian 31,000 kg, across 119 declared configurations29,000–35,000 kgDeclaredmedian 32,000 kg, across 17 declared configurations
Declared fuel, long haul38.4 l/100 km Declaredmedian; 34.2–40.6 l/100 km across 14 declared configurations36.5 l/100 km Declaredmedian; 35.4–39.6 l/100 km across 9 declared configurations
CO₂ per tonne-km52.12 g Declaredmedian; 46.42–55.01 g49.51 g Declaredmedian; 47.96–53.65 g

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

What the numbers actually say

There is 1.9 l/100 km between these two (5.2%). 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 2,280 litres a year (£3,192). The declared figures for one of them alone span 6.4 l/100 km across its configurations, so the specification ordered matters more than the choice between these two.

FM, 345 kW, 6x4 rigid lorry, 12.8 L (2020–2023) full specificationFMX, 345 kW, 6x4 rigid lorry, 10.8 L (2021–2023) full specificationThe fuel ranking

Fuel over a year

120,000 km · assumed price
Volvo FM, 345 kW, 6x4 rigid lorry, 12.8 L (2020–2023)46,080 litres
£64,512 at the assumed price
Volvo FMX, 345 kW, 6x4 rigid lorry, 10.8 L (2021–2023)43,800 litres
£61,320 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.