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

Volvo FM, 308 kW, 4x2 tractor unit (2016–2019) vs Volvo FM, 315 kW, 4x2 tractor unit (2016–2020)

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, 315 kW, 4x2 tractor unit (2016–2020)

2016–2020 · 315 kW
35.1l/100 km
median; 30.3–41.7 across 48 declared configurations
Volvo FM, 308 kW, 4x2 tractor unit (2016–2019) and Volvo FM, 315 kW, 4x2 tractor unit (2016–2020) side by side
SpecificationVolvo FM, 308 kW, 4x2 tractor unit (2016–2019)Volvo FM, 315 kW, 4x2 tractor unit (2016–2020)
Vehicle formTractor unit for semi-trailer (BC)RegisteredTractor unit for semi-trailer (BC)Registered
Axle configuration4×2Declared4×2Declared
Registered new2016–2019Registeredcentral 90% of records2016–2020Registeredcentral 90% of records
Engine power308 kWDeclared315 kWDeclared
Engine displacement10.8 litresDeclared12.8 litresDeclared
GearboxautomatedDeclaredautomatedDeclared
Emission classEURO 6, EURO VI B, EURO VI CRegisteredEURO VI B, EURO VI CRegistered
Gross vehicle weight18,800–22,000 kgRegisteredmedian 20,500 kg, across 49 type-approval versions and 7 records without one18,800–22,000 kgRegisteredmedian 21,000 kg, across 27 type-approval versions and 3 records without one
Kerb weight6,487–7,964 kgRegisteredmedian 7,296 kg, over 181 registrations6,952–11,840 kgRegisteredmedian 7,765 kg, over 72 registrations
Wheelbase3,500–3,800 mmRegisteredmedian 3,800 mm, over 181 registrations3,500–4,000 mmRegisteredmedian 3,800 mm, over 72 registrations
Overall length5,680–6,210 mmRegisteredmedian 5,990 mm, over 181 registrations5,690–6,410 mmRegisteredmedian 6,190 mm, over 72 registrations
Overall height3,360–3,890 mmRegisteredmedian 3,850 mm, over 72 registrations2,900–3,910 mmRegisteredmedian 3,880 mm, over 34 registrations
Declared fuel, long haul36.5 l/100 km Declaredmedian; 32.5–39.8 l/100 km across 20 declared configurations35.1 l/100 km Declaredmedian; 30.3–41.7 l/100 km across 48 declared configurations
CO₂ per tonne-km49.5 g Declaredmedian; 44–53.9 g47.6 g Declaredmedian; 41.1–56.6 g

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

What the numbers actually say

There is 1.4 l/100 km between these two (3.9%). 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 1,680 litres a year (£2,352). The declared figures for one of them alone span 11.4 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, 315 kW, 4x2 tractor unit (2016–2020) 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, 315 kW, 4x2 tractor unit (2016–2020)42,120 litres
£58,968 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.