AllTruckData
Comparison · 4×2 tractor unit · long haul at 19.3 t

Volvo FM, 308 kW, 4x2 tractor unit (2016–2019) vs Volvo FM, 338 kW, 4x2 tractor unit

Volvo FM, 308 kW, 4x2 tractor unit (2016–2019)

2016–2019 · 308 kW
36.5l/100 km
median; 32.5–39.8 across 20 declared configurations

Volvo FM, 338 kW, 4x2 tractor unit

2014–2019 · 338 kW
37.3l/100 km
median; 32.8–39.5 across 28 declared configurations
Volvo FM, 308 kW, 4x2 tractor unit (2016–2019) and Volvo FM, 338 kW, 4x2 tractor unit side by side
SpecificationVolvo FM, 308 kW, 4x2 tractor unit (2016–2019)Volvo FM, 338 kW, 4x2 tractor unit
Vehicle formTractor unit for semi-trailer (BC)RegisteredTractor unit for semi-trailer (BC)Registered
Axle configuration4×2Declared4×2Declared
Registered new2016–2019Registeredcentral 90% of records2014–2019Registeredcentral 90% of records
Engine power308 kWDeclared338 kWDeclared
Engine displacement10.8 litresDeclared10.8 litresDeclared
GearboxautomatedDeclaredautomatedDeclared
Emission classEURO 6, EURO VI B, EURO VI CRegisteredEEV K, EURO 5, EURO 6, EURO V, EURO VI, EURO VI B, EURO VI CRegistered
Gross vehicle weight18,800–22,000 kgRegisteredmedian 20,500 kg, across 49 type-approval versions and 7 records without one18,600–22,000 kgRegisteredmedian 20,500 kg, across 30 type-approval versions and 21 records without one
Kerb weight6,487–7,964 kgRegisteredmedian 7,296 kg, over 181 registrations6,400–7,948 kgRegisteredmedian 7,275 kg, over 73 registrations
Wheelbase3,500–3,800 mmRegisteredmedian 3,800 mm, over 181 registrations3,500–3,800 mmRegisteredmedian 3,700 mm, over 73 registrations
Overall length5,680–6,210 mmRegisteredmedian 5,990 mm, over 181 registrations5,600–6,210 mmRegisteredmedian 5,960 mm, over 73 registrations
Overall height3,360–3,890 mmRegisteredmedian 3,850 mm, over 72 registrations3,170–3,890 mmRegisteredmedian 3,400 mm, over 21 registrations
Declared fuel, long haul36.5 l/100 km Declaredmedian; 32.5–39.8 l/100 km across 20 declared configurations37.3 l/100 km Declaredmedian; 32.8–39.5 l/100 km across 28 declared configurations
CO₂ per tonne-km49.5 g Declaredmedian; 44–53.9 g50.6 g Declaredmedian; 44.5–53.6 g

Fuel and CO₂: long haul at 19.3 t, 2019 declarations.

What the numbers actually say

There is 0.8 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 960 litres a year (£1,344). The declared figures for one of them alone span 7.3 l/100 km across its configurations, so the specification ordered matters more than the choice between these two.

FM, 308 kW, 4x2 tractor unit (2016–2019) full specificationFM, 338 kW, 4x2 tractor unit full specificationThe fuel ranking

Fuel over a year

120,000 km · assumed price
Volvo FM, 308 kW, 4x2 tractor unit (2016–2019)43,800 litres
£61,320 at the assumed price
Volvo FM, 338 kW, 4x2 tractor unit44,760 litres
£62,664 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.