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

Scania R 660 A4x2 vs Scania S 770 A4x2, tractor unit (2021–2024)

Scania R 660 A4x2

2021–2024 · 485 kW
29.5l/100 km
median; 27.6–32.1 across 92 declared configurations

Scania S 770 A4x2, tractor unit (2021–2024)

2021–2024 · 566 kW
31.2l/100 km
median; 28.6–34.7 across 148 declared configurations
Scania R 660 A4x2 and Scania S 770 A4x2, tractor unit (2021–2024) side by side
SpecificationScania R 660 A4x2Scania S 770 A4x2, tractor unit (2021–2024)
Vehicle formTractor unit for semi-trailer (BC)RegisteredTractor unit for semi-trailer (BC)Registered
Axle configuration4×2Declared4×2Declared
Registered new2021–2024Registeredcentral 90% of records2021–2024Registeredcentral 90% of records
Engine power485 kWDeclared566 kWDeclared
Engine displacement16.4 litresDeclared16.4 litresDeclared
GearboxautomatedDeclaredautomatedDeclared
Emission classEURO VI D, EURO VI ERegisteredEURO VI D, EURO VI ERegistered
Gross vehicle weight19,000–23,000 kgRegisteredmedian 21,000 kg, across 21 type-approval versions and 3 records without one19,000–23,000 kgRegisteredmedian 21,000 kg, across 23 type-approval versions and 4 records without one
Kerb weight8,210–9,430 kgRegisteredmedian 8,689 kg, over 36 registrations8,352–9,677 kgRegisteredmedian 9,152 kg, over 51 registrations
Wheelbase3,750–3,950 mmRegisteredmedian 3,950 mm, over 36 registrations3,750–3,950 mmRegisteredmedian 3,750 mm, over 51 registrations
Overall length5,960–8,200 mmRegisteredmedian 6,160 mm, over 36 registrations5,960–6,320 mmRegisteredmedian 6,120 mm, over 51 registrations
Overall height3,460–4,000 mmRegisteredmedian 3,900 mm, over 34 registrations3,790–4,000 mmRegisteredmedian 3,990 mm, over 43 registrations
Declared fuel, long haul29.5 l/100 km Declaredmedian; 27.6–32.1 l/100 km across 92 declared configurations31.2 l/100 km Declaredmedian; 28.6–34.7 l/100 km across 148 declared configurations
CO₂ per tonne-km40.03 g Declaredmedian; 37.48–43.52 g42.3 g Declaredmedian; 38.84–47.03 g

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

What the numbers actually say

There is 1.7 l/100 km between these two (5.7%). 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 2,040 litres a year (£2,856). The declared figures for one of them alone span 6.1 l/100 km across its configurations, so the specification ordered matters more than the choice between these two.

R 660 A4x2 full specificationS 770 A4x2, tractor unit (2021–2024) full specificationThe fuel ranking

Fuel over a year

120,000 km · assumed price
Scania R 660 A4x235,400 litres
£49,560 at the assumed price
Scania S 770 A4x2, tractor unit (2021–2024)37,440 litres
£52,416 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.