AllTruckData
Comparison · 8×4 lorry · construction at 12.9 t

Volvo FM, 405 kW, 8x4 rigid lorry (2017–2023) vs Volvo FMX, 405 kW, 8x4 rigid lorry (2021–2023)

Volvo FM, 405 kW, 8x4 rigid lorry (2017–2023)

2017–2023 · 405 kW
41.8l/100 km
median; 40.9–43.6 across 4 declared configurations

Volvo FMX, 405 kW, 8x4 rigid lorry (2021–2023)

2021–2023 · 405 kW
43.8l/100 km
median; 40.6–48.6 across 30 declared configurations
Volvo FM, 405 kW, 8x4 rigid lorry (2017–2023) and Volvo FMX, 405 kW, 8x4 rigid lorry (2021–2023) side by side
SpecificationVolvo FM, 405 kW, 8x4 rigid lorry (2017–2023)Volvo FMX, 405 kW, 8x4 rigid lorry (2021–2023)
Vehicle formLorry (BA)RegisteredLorry (BA)Registered
Axle configuration8×4Declared8×4Declared
Registered new2017–2023Registeredcentral 90% of records2021–2023Registeredcentral 90% of records
Engine power405 kWDeclared405 kWDeclared
Engine displacement12.8 litresDeclared12.8 litresDeclared
GearboxautomatedDeclaredautomatedDeclared
Emission classEURO 6, EURO VI, EURO VI B, EURO VI C, EURO VI D, EURO VI ERegisteredEURO VI ERegistered
Gross vehicle weight39,000–46,000 kgRegisteredmedian 43,000 kg, over 23 registrations44,000 kgRegistered
Kerb weight10,300–28,054 kgRegisteredmedian 17,955 kg, over 23 registrations14,625 kgRegistered
Wheelbase6,100–7,950 mmRegisteredmedian 6,700 mm, over 23 registrations6,450 mmRegistered
Overall length8,680–10,900 mmRegisteredmedian 9,630 mm, over 23 registrations9,220 mmRegistered
Overall height3,550–3,950 mmRegisteredmedian 3,760 mm, over 10 registrations3,200 mmRegistered
Declared fuel, construction41.8 l/100 km Declaredmedian; 40.9–43.6 l/100 km across 4 declared configurations43.8 l/100 km Declaredmedian; 40.6–48.6 l/100 km across 30 declared configurations
CO₂ per tonne-km84.8 g Declaredmedian; 83.02–88.42 g88.93 g Declaredmedian; 82.27–98.6 g

Fuel and CO₂: construction at 12.9 t, 2022 declarations.

What the numbers actually say

There is 2 l/100 km between these two (4.7%). 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 2,400 litres a year (£3,360). The declared figures for one of them alone span 8 l/100 km across its configurations, so the specification ordered matters more than the choice between these two.

FM, 405 kW, 8x4 rigid lorry (2017–2023) full specificationFMX, 405 kW, 8x4 rigid lorry (2021–2023) full specification

Fuel over a year

120,000 km · assumed price
Volvo FM, 405 kW, 8x4 rigid lorry (2017–2023)50,160 litres
£70,224 at the assumed price
Volvo FMX, 405 kW, 8x4 rigid lorry (2021–2023)52,560 litres
£73,584 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.