Car comparison

BMW 6 Series Convertible (F12) 650ivsRolls-Royce Phantom Drophead Coupe 6.75 i V12

Compare specs, acceleration, fuel consumption, dimensions, practicality, and estimated running costs side by side.

New comparison

BMW 6 Series Convertible (F12)

650i

407 hp4395 ccGasolineRWDAutomaticTurbochargedCabriolet / convertible2011-2012

Rolls-Royce Phantom Drophead Coupe

6.75 i V12

460 hp6749 ccGasolineRWDAutomaticNaturally aspiratedCabriolet / convertible2007-2016

Comparison overview

Use the estimates as comparison hints and verify exact figures before making decisions.

BMW 6 Series Convertible (F12) 650i

Quickest 0-100 km/h
5.0 s
Fastest top speed
260 km/h
162 mph Unrestricted
250 km/h
155 mph Restricted
Lightest
1,940 kg
4,277 lb
Best power-to-weight
210 hp/t
156 kW/t
4.8 kg/hp
Lowest combined fuel consumption
10.7 L/100 km
22.0 mpg US
26.4 mpg UK
Lowest city consumption
15.5 L/100 km
15.2 mpg US
18.2 mpg UK
Lowest highway consumption
7.9 L/100 km
29.8 mpg US
35.8 mpg UK
Best estimated range
654 km
407 mi
Best performance score
74/100
Best economy score
78/100

Rolls-Royce Phantom Drophead Coupe 6.75 i V12

Most powerful
460 hp
343 kW
Highest torque
720 Nm
531 lb-ft
Largest trunk
315 L
Best overall score
67/100
Best practicality score
53/100

Specification comparison

Specification comparison
Model	BMW6 Series Convertible (F12)650i	Rolls-RoycePhantom Drophead Coupe6.75 i V12
Power	407hp304kW	460hp343kW
Torque	600Nm443lb-ft	720Nm531lb-ft
Curb weight	1,940kg4,277lb	2,620kg5,776lb
Gross weight	2,390kg5,269lb	3,050kg6,724lb
Top speed	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Calculated	Unrestricted 250 km/h155 mph Restricted 240 km/h149 mph Calculated
To 99% top speed	70.2s99% target: 257 km/h / 160 mph Calculated	98.3s99% target: 248 km/h / 154 mph Calculated
0-100 km/h	5.0s	5.9s
0-200 km/h	18.3s Calculated	25.6s Calculated
0-60 mph	4.7s Calculated	5.6s Calculated
Fuel consumption	10.7L/100 km22mpg US26.4mpg UK	15.9L/100 km14.8mpg US17.8mpg UK
Fuel consumption city	15.5L/100 km15.2mpg US18.2mpg UK	24.6L/100 km9.6mpg US11.5mpg UK
Fuel consumption highway	7.9L/100 km29.8mpg US35.8mpg UK	11L/100 km21.4mpg US25.7mpg UK
Quarter mile	13.2s Calculated	14.1s Calculated
Power-to-weight	210hp/t156kW/t95hp/1000 lb Calculated	176hp/t131kW/t80hp/1000 lb Calculated
Torque-to-weight	309Nm/t207lb-ft/ton Calculated	275Nm/t184lb-ft/ton Calculated
Estimated range	654km407mi Calculated	503km313mi Calculated
Displacement	4,395cc268cu in	6,749cc412cu in
Length	4,894mm193in	5,609mm221in
Width	1,894mm75in	1,987mm78in
Height	1,365mm54in	1,581mm62in
Wheelbase	2,855mm112in	3,320mm131in
Front track	1,600mm63in	1,685mm66in
Rear track	1,665mm66in	1,670mm66in
Ground clearance	123mm5in	-
Trunk volume	300L	315L
Max trunk volume	350L	-
Doors	2	2
Seats	4	5
Fuel tank	70L	80L
CO2 emissions	249g/km	-

Performance charts

Use the estimates as comparison hints and verify exact figures before making decisions.

Dyno simulation

Estimated stock-style power and torque curves by engine speed.

BMW 6 Series Convertible (F12) 650iRolls-Royce Phantom Drophead Coupe 6.75 i V12PowerTorque

Dyno simulation data table
Vehicle	Peak power RPM	Peak torque RPM	Max engine speed
BMW6 Series Convertible (F12)650i	5,500-6,400 rpm	1,750-4,500 rpm	6,650 rpm
Rolls-RoycePhantom Drophead Coupe6.75 i V12	5,350 rpm	3,500 rpm	5,600 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
Metric	BMW6 Series Convertible (F12)650i	Rolls-RoycePhantom Drophead Coupe6.75 i V12
	Acceleration checkpoints
0-60 mph 0-97 km/h	4.7 s	5.6 s
0-100 km/h 0-62 mph	5.0 s	5.9 s
0-200 km/h 0-124 mph	18.3 s	25.6 s
Top speed	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Likely limited	Unrestricted 250 km/h155 mph Restricted 240 km/h149 mph Likely limited
	Drag race simulation
60 ft 18 m	2.1 s	2.2 s
330 ft 101 m	5.7 s	6.0 s
1/8 mile 201 m	8.6 s	9.1 s
1000 ft 305 m	11.1 s	11.8 s
1/4 mile 402 m	13.2 s	14.1 s
Trap speed 1/4 mile 402 m	174 km/h 108 mph	159 km/h 99 mph

Power comparison

Bar comparison chart for Power. Higher is better · hp / kW

Chart data table
Vehicle	Value
BMW6 Series Convertible (F12)650i	407 hp 304 kW
Rolls-RoycePhantom Drophead Coupe6.75 i V12	460 hp 343 kW

Rolls-Royce Phantom Drophead Coupe 6.75 i V12 has 53 hp more than BMW 6 Series Convertible (F12) 650i.

The biggest power difference is between BMW 6 Series Convertible (F12) 650i and Rolls-Royce Phantom Drophead Coupe 6.75 i V12: 53 hp (40 kW).

Torque comparison

Bar comparison chart for Torque. Higher is better · Nm / lb-ft

Chart data table
Vehicle	Value
BMW6 Series Convertible (F12)650i	600 Nm 443 lb-ft
Rolls-RoycePhantom Drophead Coupe6.75 i V12	720 Nm 531 lb-ft

Curb weight comparison

Bar comparison chart for Curb weight. Lower is better · kg / lb

Chart data table
Vehicle	Value
BMW6 Series Convertible (F12)650i	1,940 kg 4,277 lb
Rolls-RoycePhantom Drophead Coupe6.75 i V12	2,620 kg 5,776 lb

Top speed without limiter comparison

Bar comparison chart for Top speed without limiter. Higher is better · km/h / mph

Chart data table
Vehicle	Value
BMW6 Series Convertible (F12)650i	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph
Rolls-RoycePhantom Drophead Coupe6.75 i V12	Unrestricted 250 km/h155 mph Restricted 240 km/h149 mph

0-100 km/h comparison

Bar comparison chart for 0-100 km/h. Lower is better · seconds

Chart data table
Vehicle	Value
BMW6 Series Convertible (F12)650i	5.0 s
Rolls-RoycePhantom Drophead Coupe6.75 i V12	5.9 s

Although Rolls-Royce Phantom Drophead Coupe 6.75 i V12 has more power, BMW 6 Series Convertible (F12) 650i is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between BMW 6 Series Convertible (F12) 650i and Rolls-Royce Phantom Drophead Coupe 6.75 i V12: 0.9 s.

Fuel consumption comparison

Bar comparison chart for Fuel consumption. Lower is better · L/100 km / mpg US / mpg UK

Chart data table
Vehicle	Value
BMW6 Series Convertible (F12)650i	10.7 L/100 km 22.0 mpg US 26.4 mpg UK
Rolls-RoycePhantom Drophead Coupe6.75 i V12	15.9 L/100 km 14.8 mpg US 17.8 mpg UK

The biggest fuel consumption difference is between BMW 6 Series Convertible (F12) 650i and Rolls-Royce Phantom Drophead Coupe 6.75 i V12: 5.2 L/100 km.

Power-to-weight comparison

Bar comparison chart for Power-to-weight. Higher is better · hp/t / kW/t

Chart data table
Vehicle	Value
BMW6 Series Convertible (F12)650i	210 hp/t 156 kW/t 4.8 kg/hp
Rolls-RoycePhantom Drophead Coupe6.75 i V12	176 hp/t 131 kW/t 5.7 kg/hp

Estimated range comparison

Bar comparison chart for Estimated range. Higher is better · km / mi

Chart data table
Vehicle	Value
BMW6 Series Convertible (F12)650i	654 km 407 mi
Rolls-RoycePhantom Drophead Coupe6.75 i V12	503 km 313 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
Vehicle	Power	Acceleration	Top speed
BMW6 Series Convertible (F12)650i	407 hp 304 kW	5.0 s	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph
Rolls-RoycePhantom Drophead Coupe6.75 i V12	460 hp 343 kW	5.9 s	Unrestricted 250 km/h155 mph Restricted 240 km/h149 mph

Most attractive quadrant

Scatter chart with performance score on the X axis and practicality score on the Y axis.

Vehicle

Performance score

Practicality score

BMW6 Series Convertible (F12)650i

Power	407 hp 304 kW
0-100 km/h	5.0 s
Top speed Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph

Doors/seats	2 doors 4 seats
Trunk	300 L 10.6 cu ft
Length	4,894 mm 192.7 in
Height	1,365 mm 53.7 in

Rolls-RoycePhantom Drophead Coupe6.75 i V12

Power	460 hp 343 kW
0-100 km/h	5.9 s
Top speed Unrestricted 250 km/h155 mph Restricted 240 km/h149 mph

Doors/seats	2 doors 5 seats
Trunk	315 L 11.1 cu ft
Length	5,609 mm 220.8 in
Height	1,581 mm 62.2 in

Performance vs fuel economy

Cars closer to the top-right corner combine stronger performance with better fuel economy scores.

Vehicle

Performance score

Fuel economy score

BMW6 Series Convertible (F12)650i

Power	407 hp 304 kW
0-100 km/h	5.0 s
Top speed Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph

10.7 L/100 km

22.0 mpg US

26.4 mpg UK

Rolls-RoycePhantom Drophead Coupe6.75 i V12

Power	460 hp 343 kW
0-100 km/h	5.9 s
Top speed Unrestricted 250 km/h155 mph Restricted 240 km/h149 mph

15.9 L/100 km

14.8 mpg US

17.8 mpg UK

BMW 6 Series Convertible (F12) 650i is closest to the top-right balance target for performance and fuel economy.

Acceleration vs fuel consumption

Cars closer to the lower-left corner offer a better mix of quick acceleration and low fuel consumption.

Acceleration vs fuel consumption data table
Vehicle	Fuel consumption, L/100 km	0-100 km/h, s
BMW6 Series Convertible (F12)650i	10.7 L/100 km 22.0 mpg US 26.4 mpg UK	5.0 s
Rolls-RoycePhantom Drophead Coupe6.75 i V12	15.9 L/100 km 14.8 mpg US 17.8 mpg UK	5.9 s

Power-to-weight vs fuel consumption

The shaded area favors higher power-to-weight with lower combined fuel consumption.

Power-to-weight vs fuel consumption data table
Vehicle	Power-to-weight, hp/t	Fuel consumption, L/100 km
BMW6 Series Convertible (F12)650i	210 hp/t 156 kW/t 4.8 kg/hp	10.7 L/100 km 22.0 mpg US 26.4 mpg UK
Rolls-RoycePhantom Drophead Coupe6.75 i V12	176 hp/t 131 kW/t 5.7 kg/hp	15.9 L/100 km 14.8 mpg US 17.8 mpg UK

Detailed score breakdown

Vehicle

BMW6 Series Convertible (F12)650i

Rolls-RoycePhantom Drophead Coupe6.75 i V12

Power

407 hp

304 kW

460 hp

343 kW

Torque

600 Nm

443 lb-ft

720 Nm

531 lb-ft

Acceleration

5.0 s

5.9 s

Top speed

Unrestricted

260 km/h162 mph

Restricted

250 km/h155 mph

Unrestricted

250 km/h155 mph

Restricted

240 km/h149 mph

Lightness

1,940 kg

4,277 lb

2,620 kg

5,776 lb

Fuel consumption

10.7 L/100 km

22.0 mpg US

26.4 mpg UK

15.9 L/100 km

14.8 mpg US

17.8 mpg UK

Practicality

Doors/seats	2 doors 4 seats
Trunk	300 L 10.6 cu ft
Length	4,894 mm 192.7 in
Height	1,365 mm 53.7 in

Doors/seats	2 doors 5 seats
Trunk	315 L 11.1 cu ft
Length	5,609 mm 220.8 in
Height	1,581 mm 62.2 in

Range score

654 km

407 mi

503 km

313 mi

CO2 score

249 g/km

Trunk score

300 L

10.6 cu ft

315 L

11.1 cu ft

Power-to-weight score

210 hp/t

156 kW/t

4.8 kg/hp

176 hp/t

131 kW/t

5.7 kg/hp

Overall

Fixed score

Fuel cost and annual usage

Estimate running costs from combined consumption, your annual distance, and the fuel price in your local currency.

Average annual distanceDistance unitFuel price in your local currencyPrice unit

Enter the fuel price in your local currency, for example €/L, $/gal, £/L or any other local currency.

LC = Local Currency

Fuel cost and annual usage
Vehicle	BMW 6 Series Convertible (F12) 650i	Rolls-Royce Phantom Drophead Coupe 6.75 i V12
Consumption	10.7 L/100 km22 mpg US26.4 mpg UK	15.9 L/100 km14.8 mpg US17.8 mpg UK
Cost / 100 km	18.72 LC100 km	27.83 LC100 km
Cost / 100 mi	30.13 LC100 mi	44.78 LC100 mi
Annual fuel used	1,605 L424 US gal353 UK gal	2,385 L630 US gal525 UK gal
Annual fuel cost	2,809 LC/year	4,174 LC/year