AllTruckData
Comparison · 6×4 tractor unit · long haul at 19.3 t

Scania R 770 A6x4 vs Scania S 660 A6x4

Scania R 770 A6x4

2021–2023 · 566 kW
36.9l/100 km
median; 33.1–41.7 across 45 declared configurations

Scania S 660 A6x4

2022–2025 · 485 kW
33.9l/100 km
median; 31–41.9 across 53 declared configurations
Scania R 770 A6x4 and Scania S 660 A6x4 side by side
SpecificationScania R 770 A6x4Scania S 660 A6x4
Vehicle formTractor unit for semi-trailer (BC)RegisteredTractor unit for semi-trailer (BC)Registered
Axle configuration6×4Declared6×4Declared
Registered new2021–2023Registeredcentral 90% of records2022–2025Registeredcentral 90% of records
Engine power566 kWDeclared485 kWDeclared
Engine displacement16.4 litresDeclared16.4 litresDeclared
GearboxautomatedDeclaredautomatedDeclared
Emission classEURO VI ERegisteredEURO VI, EURO VI ERegistered
Gross vehicle weight30,000–35,000 kgRegisteredmedian 30,000 kg, across 1 type-approval version and 1 record without one28,000–36,000 kgRegisteredmedian 30,000 kg, across 6 type-approval versions and 9 records without one
Kerb weight9,744–10,396 kgRegisteredmedian 9,744 kg, over 2 registrations10,155–10,865 kgRegisteredmedian 10,545 kg, over 23 registrations
Wheelbase4,500–4,700 mmRegisteredmedian 4,500 mm, over 2 registrations4,500–5,300 mmRegisteredmedian 4,700 mm, over 23 registrations
Overall length6,870–6,910 mmRegisteredmedian 6,870 mm, over 2 registrations6,800–7,560 mmRegisteredmedian 6,910 mm, over 23 registrations
Overall height3,450–3,840 mmRegisteredmedian 3,450 mm, over 2 registrations3,770–4,000 mmRegisteredmedian 3,990 mm, over 22 registrations
Declared fuel, long haul36.9 l/100 km Declaredmedian; 33.1–41.7 l/100 km across 45 declared configurations33.9 l/100 km Declaredmedian; 31–41.9 l/100 km across 53 declared configurations
CO₂ per tonne-km50 g Declaredmedian; 44.91–56.6 g45.9 g Declaredmedian; 42.08–56.82 g

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

What the numbers actually say

There is 3 l/100 km between these two (8.8%). 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 3,600 litres a year (£5,040). The declared figures for one of them alone span 10.9 l/100 km across its configurations, so the specification ordered matters more than the choice between these two.

R 770 A6x4 full specificationS 660 A6x4 full specificationThe fuel ranking

Fuel over a year

120,000 km · assumed price
Scania R 770 A6x444,280 litres
£61,992 at the assumed price
Scania S 660 A6x440,680 litres
£56,952 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.