AllTruckData
Comparison · 6×2 tractor unit · long haul at 19.3 t

Volvo FH, 345 kW, 6x2 tractor unit (from 2020) vs Volvo FM, 345 kW, 6x2 tractor unit, 12.8 L (2016–2023)

Volvo FH, 345 kW, 6x2 tractor unit (from 2020)

2020–2026 · 345 kW
29.3l/100 km
median; 27–35.9 across 321 declared configurations

Volvo FM, 345 kW, 6x2 tractor unit, 12.8 L (2016–2023)

2016–2023 · 345 kW
31.5l/100 km
median; 29–38.8 across 12 declared configurations
Volvo FH, 345 kW, 6x2 tractor unit (from 2020) and Volvo FM, 345 kW, 6x2 tractor unit, 12.8 L (2016–2023) side by side
SpecificationVolvo FH, 345 kW, 6x2 tractor unit (from 2020)Volvo FM, 345 kW, 6x2 tractor unit, 12.8 L (2016–2023)
Vehicle formTractor unit for semi-trailer (BC)RegisteredTractor unit for semi-trailer (BC)Registered
Axle configuration6×2Declared6×2Declared
Registered new2020–2026Registeredcentral 90% of records2016–2023Registeredcentral 90% of records
Engine power345 kWDeclared345 kWDeclared
Engine displacement12.8 litresDeclared12.8 litresDeclared
GearboxautomatedDeclaredautomatedDeclared
Emission classEURO 6, EURO VI D, EURO VI ERegisteredEEV, EURO 6, EURO V, EURO VI B, EURO VI C, EURO VI D, EURO VI ERegistered
Gross vehicle weight23,100–33,000 kgRegisteredmedian 27,000 kg, across 115 type-approval versions and 81 records without one23,500–31,000 kgRegisteredmedian 27,000 kg, across 25 type-approval versions and 11 records without one
Kerb weight6,849–22,768 kgRegisteredmedian 8,893 kg, over 1,115 registrations7,725–20,320 kgRegisteredmedian 8,766 kg, over 56 registrations
Wheelbase3,700–5,270 mmRegisteredmedian 4,100 mm, over 1,115 registrations3,800–5,070 mmRegisteredmedian 4,100 mm, over 56 registrations
Overall length5,990–7,810 mmRegisteredmedian 6,510 mm, over 1,115 registrations6,200–7,300 mmRegisteredmedian 6,510 mm, over 56 registrations
Overall height3,420–4,000 mmRegisteredmedian 3,850 mm, over 301 registrations3,000–3,950 mmRegisteredmedian 3,400 mm, over 19 registrations
Declared fuel, long haul29.3 l/100 km Declaredmedian; 27–35.9 l/100 km across 321 declared configurations31.5 l/100 km Declaredmedian; 29–38.8 l/100 km across 12 declared configurations
CO₂ per tonne-km39.75 g Declaredmedian; 36.57–48.66 g42.72 g Declaredmedian; 39.36–52.7 g

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

What the numbers actually say

There is 2.2 l/100 km between these two (7.5%). 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 2,640 litres a year (£3,696). The declared figures for one of them alone span 9.8 l/100 km across its configurations, so the specification ordered matters more than the choice between these two.

FH, 345 kW, 6x2 tractor unit (from 2020) full specificationFM, 345 kW, 6x2 tractor unit, 12.8 L (2016–2023) full specificationThe fuel ranking

Fuel over a year

120,000 km · assumed price
Volvo FH, 345 kW, 6x2 tractor unit (from 2020)35,160 litres
£49,224 at the assumed price
Volvo FM, 345 kW, 6x2 tractor unit, 12.8 L (2016–2023)37,800 litres
£52,920 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.