Rolls-Royce Dawn

Rolls-Royce Dawn: which 6.6 AT to buy — 570 hp vs 601 hp

If you are choosing a Rolls-Royce Dawn, there is only 1 generation (2015-09-01 to 2022-12-31), one body — Cabrio — and two catalogue versions, both named 6.6 AT. The buy decision is not generation versus generation.

If you are choosing a Rolls-Royce Dawn, there is only 1 generation (2015-09-01 to 2022-12-31), one body — Cabrio — and two catalogue versions, both named 6.6 AT. The buy decision is not generation versus generation. It is 6.6 AT 570 hp versus 6.6 AT 601 hp: +31 hp, +22 kW, +60 Nm on the stronger car, the same 4.9 s to 100 km/h, the same 250 km/h, the same 2560 kg kerb weight, and a 2.1 L/100 km higher combined consumption on 6.6 AT 601 hp (16.3 versus 14.2). Wheel sizes are measured only on 6.6 AT 570 hp; on 6.6 AT 601 hp they are not measured.

Specs: both versions are named 6.6 AT — split them by horsepower

Both rows in the data use the exact catalogue name 6.6 AT. Treat them as two different cars by power, the same way two identical gearbox labels are told apart on other models.

Shared engine facts that do not change the ranking: front, longitudinal; Direct injection (direct); compression 10; bore × stroke 89 × 88.3; fuel 98; Euro 6; CO2 330.

6.6 AT 601 hp is +31 hp (+5.4%) and +22 kW versus 6.6 AT 570 hp. Torque is +60 Nm (+7.7%). Peak power rpm is the same (5250). Peak torque rpm is the same (1500). Displacement is the same 6592. Cylinder count, V-shaped layout, Turbo, Automatic 8, and RWD do not differ. The extra output is not a second engine family in this table; it is a higher hp/Nm pair on the same 6592 Gasoline 12-cylinder Turbo package.

Power per litre (hp ÷ 6592/1000): 6.6 AT 570 hp → 86.5 hp/L; 6.6 AT 601 hp → 91.2 hp/L (+4.7 hp/L). Torque per litre: 118.3 Nm/L versus 127.4 Nm/L. Those ratios use only the given displacement and outputs.

Performance and mpg: same sprint, different combined figure

Acceleration to 100 km/h is 4.9 on both. Top speed is 250 on both. Buying 6.6 AT 601 hp does not buy a shorter 0–100 or a higher listed maximum in this dataset. The +31 hp and +60 Nm do not show up as a faster catalogue sprint.

City: 6.6 AT 601 hp is 0.2 L/100 km lower than 6.6 AT 570 hp (21.2 versus 21.4). Highway is identical at 9.8. Combined is the split that matters: 16.3 versus 14.2, so 6.6 AT 601 hp uses 2.1 L/100 km more on the mixed cycle (+14.8% versus 14.2). CO2 is 330 on both, so the combined-fuel gap is not mirrored by a different CO2 number here.

Tank is 82 on both. Highway range from 82 ÷ 9.8 × 100 is 837 km for either version. City: 82 ÷ 21.4 × 100 ≈ 383 km for 6.6 AT 570 hp; 82 ÷ 21.2 × 100 ≈ 387 km for 6.6 AT 601 hp. Combined: 82 ÷ 14.2 × 100 ≈ 577 km versus 82 ÷ 16.3 × 100 ≈ 503 km. The 601 hp car gives up about 74 km of mixed-cycle range on the same 82 tank.

If the question is “mpg / consumption,” 6.6 AT 570 hp is the lower combined number. If the question is city-only, the 601 hp row is 0.2 L/100 km better. Highway does not decide the purchase.

Dimensions and weight: same mass, wheels only on 570 hp

Kerb 2560, gross 3040, payload 3040 − 2560 = 480 on both. Ground clearance 140 on both. You do not get a lighter Dawn by taking the 601 hp row.

Weight per horsepower: 2560 ÷ 570 = 4.49 kg/hp for 6.6 AT 570 hp; 2560 ÷ 601 = 4.26 kg/hp for 6.6 AT 601 hp. The stronger car is 0.23 kg/hp less laden on paper because mass is unchanged and power is higher — not because the 601 hp version is lighter.

Front suspension Independent, pneumatic; rear Independent, pneumatic; front brakes Ventilated disc; rear Disc ventilated — same wording on both (rear label as in the data). Chassis specification does not separate the two 6.6 AT rows.

Wheels: 6.6 AT 570 hp lists 255/45 R20 and 285/40 R20. 6.6 AT 601 hp wheels are not measured. Do not assume the 601 hp car has no tyres or the same sizes; the field is empty in the source.

Generations: there is nothing later to wait for in this table

1 generation only: start 2015-09-01, stop 2022-12-31, body Cabrio, 2 versions, both 6.6 AT. There is no second generation, no restyling generation, and no later body type in the data. A “which generation” question collapses to “which 6.6 AT.” Year span is the same on both modifications (2015-09-01 to 2022-12-31), so calendar years do not rank one version over the other.

Which version to choose

Choose 6.6 AT 570 hp if you want the lower combined consumption (14.2 vs 16.3), the longer mixed range on the 82 tank (~577 km vs ~503 km), and the only measured wheel sizes in this catalogue (255/45 R20, 285/40 R20). You give up 31 hp and 60 Nm. You do not give up 0–100 (still 4.9), top speed (still 250), kerb weight (still 2560), clearance (140), gearbox (Automatic 8), or drive (RWD).

Choose 6.6 AT 601 hp if the ranking you care about is output: 601 hp / 442 kW / 840 Nm versus 570 / 420 / 780, 91.2 hp/L versus 86.5, 4.26 kg/hp versus 4.49. City use is 0.2 L/100 km lower (21.2 vs 21.4). Highway is a tie at 9.8. Combined is worse by 2.1 L/100 km. Wheels: not measured. Sprint and top speed do not improve in the table.

What the extra output does not buy (in these numbers): a second generation, a different body, a different displacement, a different cylinder count or layout, a different boost type, a different gearbox or drive, a lower kerb weight, a larger tank, a lower CO2 figure, a faster 0–100, or a higher 250 cap. The arithmetic of the extra 31 hp and 60 Nm is real; the performance columns do not convert that arithmetic into a shorter 4.9 or a number above 250.

Problems / reliability: not measured in this dataset. No failure rates, no service intervals, no common faults. Do not read silence as “no problems.”

Price: not measured. “What the extra money buys” can only be answered as what the extra 31 hp / 60 Nm buys in the spec sheet — not as a currency delta.

Short ranking from the given numbers only: if combined fuel and documented wheels decide it, 6.6 AT 570 hp. If peak hp, kW, Nm, hp/L, and kg/hp decide it, 6.6 AT 601 hp. If 0–100, top speed, mass, clearance, tank, Automatic 8, and RWD decide it, the two versions are equal.