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

Volvo FM, 323 kW, 8x4 rigid lorry vs Volvo FMX, 323 kW, 8x4 rigid lorry

Volvo FM, 323 kW, 8x4 rigid lorry

2020–2023 · 323 kW
42.6l/100 km
median; 38.7–44.8 across 28 declared configurations

Volvo FMX, 323 kW, 8x4 rigid lorry

2021–2023 · 323 kW
43.5l/100 km
median; 39.3–47.2 across 18 declared configurations
Volvo FM, 323 kW, 8x4 rigid lorry and Volvo FMX, 323 kW, 8x4 rigid lorry side by side
SpecificationVolvo FM, 323 kW, 8x4 rigid lorryVolvo FMX, 323 kW, 8x4 rigid lorry
Vehicle formLorry (BA)RegisteredLorry (BA)Registered
Axle configuration8×4Declared8×4Declared
Registered new2020–2023Registeredcentral 90% of records2021–2023Registeredcentral 90% of records
Engine power323 kWDeclared323 kWDeclared
Engine displacement10.8 litresDeclared10.8 litresDeclared
GearboxautomatedDeclaredautomatedDeclared
Emission classEURO VI D, EURO VI ERegisteredNot recorded
Gross vehicle weight36,000–43,000 kgRegisteredmedian 43,000 kg, across 1 type-approval version and 7 records without one35,000–40,000 kgDeclaredmedian 39,000 kg, across 43 declared configurations
Kerb weight11,250–20,969 kgRegisteredmedian 13,220 kg, over 8 registrationsNot recorded
Wheelbase5,950–7,050 mmRegisteredmedian 6,450 mm, over 8 registrationsNot recorded
Overall length8,500–10,350 mmRegisteredmedian 9,440 mm, over 8 registrationsNot recorded
Overall height3,150–3,970 mmRegisteredmedian 3,150 mm, over 2 registrationsNot recorded
Declared fuel, construction42.6 l/100 km Declaredmedian; 38.7–44.8 l/100 km across 28 declared configurations43.5 l/100 km Declaredmedian; 39.3–47.2 l/100 km across 18 declared configurations
CO₂ per tonne-km86.4 g Declaredmedian; 78.5–90.9 g88.3 g Declaredmedian; 79.82–95.83 g

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

What the numbers actually say

There is 0.9 l/100 km between these two (2.1%). 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 1,080 litres a year (£1,512). The declared figures for one of them alone span 7.9 l/100 km across its configurations, so the specification ordered matters more than the choice between these two.

FM, 323 kW, 8x4 rigid lorry full specificationFMX, 323 kW, 8x4 rigid lorry full specificationThe fuel ranking

Fuel over a year

120,000 km · assumed price
Volvo FM, 323 kW, 8x4 rigid lorry51,120 litres
£71,568 at the assumed price
Volvo FMX, 323 kW, 8x4 rigid lorry52,200 litres
£73,080 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.