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

Scania R 660 A6x4 vs Scania S 770 A6x4

Scania R 660 A6x4

2021–2023 · 485 kW
34l/100 km
median; 31.7–38.9 across 83 declared configurations

Scania S 770 A6x4

2021–2025 · 566 kW
35.6l/100 km
median; 33.6–41.9 across 45 declared configurations
Scania R 660 A6x4 and Scania S 770 A6x4 side by side
SpecificationScania R 660 A6x4Scania S 770 A6x4
Vehicle formTractor unit for semi-trailer (BC)RegisteredTractor unit for semi-trailer (BC)Registered
Axle configuration6×4Declared6×4Declared
Registered new2021–2023Registeredcentral 90% of records2021–2025Registeredcentral 90% of records
Engine power485 kWDeclared566 kWDeclared
Engine displacement16.4 litresDeclared16.4 litresDeclared
GearboxautomatedDeclaredautomatedDeclared
Emission classEURO VI, EURO VI ERegisteredEURO 6, EURO VI, EURO VI D, EURO VI ERegistered
Gross vehicle weight28,500–36,000 kgRegisteredmedian 30,000 kg, across 7 type-approval versions and 4 records without one29,000–36,000 kgRegisteredmedian 35,000 kg, across 8 type-approval versions and 8 records without one
Kerb weight10,003–15,108 kgRegisteredmedian 10,507 kg, over 11 registrations9,990–12,278 kgRegisteredmedian 10,634 kg, over 16 registrations
Wheelbase4,300–5,300 mmRegisteredmedian 4,700 mm, over 11 registrations4,500–5,300 mmRegisteredmedian 4,500 mm, over 16 registrations
Overall length6,670–7,560 mmRegisteredmedian 7,060 mm, over 11 registrations6,800–7,570 mmRegisteredmedian 6,870 mm, over 16 registrations
Overall height3,560–4,000 mmRegisteredmedian 3,760 mm, over 10 registrations3,850–4,000 mmRegisteredmedian 3,990 mm, over 12 registrations
Declared fuel, long haul34 l/100 km Declaredmedian; 31.7–38.9 l/100 km across 83 declared configurations35.6 l/100 km Declaredmedian; 33.6–41.9 l/100 km across 45 declared configurations
CO₂ per tonne-km46.04 g Declaredmedian; 42.98–52.71 g48.32 g Declaredmedian; 45.58–56.84 g

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

What the numbers actually say

There is 1.6 l/100 km between these two (4.7%). 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 1,920 litres a year (£2,688). The declared figures for one of them alone span 8.3 l/100 km across its configurations, so the specification ordered matters more than the choice between these two.

R 660 A6x4 full specificationS 770 A6x4 full specificationThe fuel ranking

Fuel over a year

120,000 km · assumed price
Scania R 660 A6x440,800 litres
£57,120 at the assumed price
Scania S 770 A6x442,720 litres
£59,808 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.