Car comparison

BMW 6 Series Convertible (F12) 650ivsRolls-Royce Phantom Drophead Coupe · Facelift 2012 6.7 V12

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

New comparison

BMW 6 Series Convertible (F12)

650i

450 hp4395 ccGasolineAWDAutomaticTurbochargedCabriolet / convertible2012-2015

Rolls-Royce Phantom Drophead Coupe · Facelift 2012

6.7 V12

460 hp6749 ccGasolineRWDAutomaticNaturally aspiratedCabriolet / convertible2012-2016

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
4.5 s
Fastest top speed
260 km/h
162 mph Unrestricted
250 km/h
155 mph Restricted
Lightest
1,980 kg
4,365 lb
Best power-to-weight
227 hp/t
169 kW/t
4.4 kg/hp
Lowest combined fuel consumption
9.5 L/100 km
24.8 mpg US
29.7 mpg UK
Lowest city consumption
13.3 L/100 km
17.7 mpg US
21.2 mpg UK
Lowest highway consumption
7.3 L/100 km
32.2 mpg US
38.7 mpg UK
Lowest CO2 emissions
221 g/km
Best estimated range
737 km
458 mi
Best overall score
68/100
Best performance score
79/100
Best economy score
81/100

Rolls-Royce Phantom Drophead Coupe Facelift 2012 6.7 V12

Most powerful
460 hp
343 kW
Highest torque
720 Nm
531 lb-ft
Largest trunk
395 L
Best practicality score
51/100

Specification comparison

Specification comparison
Model	BMW6 Series Convertible (F12)650i	Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12
Power	450hp336kW	460hp343kW
Torque	650Nm479lb-ft	720Nm531lb-ft
Curb weight	1,980kg4,365lb	2,630kg5,798lb
Gross weight	2,480kg5,467lb	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	61.4s99% target: 257 km/h / 160 mph Calculated	95.9s99% target: 248 km/h / 154 mph Calculated
0-100 km/h	4.5s	5.8s
0-200 km/h	16.3s Calculated	25.1s Calculated
0-60 mph	4.3s Calculated	5.5s Calculated
Fuel consumption	9.5L/100 km24.8mpg US29.7mpg UK	14.8L/100 km15.9mpg US19.1mpg UK
Fuel consumption city	13.3L/100 km17.7mpg US21.2mpg UK	22.8L/100 km10.3mpg US12.4mpg UK
Fuel consumption highway	7.3L/100 km32.2mpg US38.7mpg UK	10.2L/100 km23.1mpg US27.7mpg UK
Quarter mile	12.6s Calculated	14.0s Calculated
Power-to-weight	227hp/t169kW/t103hp/1000 lb Calculated	175hp/t130kW/t79hp/1000 lb Calculated
Torque-to-weight	328Nm/t220lb-ft/ton Calculated	274Nm/t183lb-ft/ton Calculated
Estimated range	737km458mi Calculated	541km336mi Calculated
Displacement	4,395cc268cu in	6,749cc412cu in
Length	4,894mm193in	5,612mm221in
Width	1,894mm75in	1,987mm78in
Height	1,365mm54in	1,566mm62in
Wheelbase	2,855mm112in	3,320mm131in
Front track	1,600mm63in	1,686mm66in
Rear track	1,665mm66in	1,676mm66in
Ground clearance	123mm5in	-
Trunk volume	300L	395L
Max trunk volume	350L	-
Doors	2	2
Seats	4	4
Fuel tank	70L	80L
CO2 emissions	221g/km	347g/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 Facelift 2012 6.7 V12PowerTorque

Dyno simulation data table
Vehicle	Peak power RPM	Peak torque RPM	Max engine speed
BMW6 Series Convertible (F12)650i	5,500 rpm	2,000-4,500 rpm	5,750 rpm
Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 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 CoupeFacelift 20126.7 V12
	Acceleration checkpoints
0-60 mph 0-97 km/h	4.3 s	5.5 s
0-100 km/h 0-62 mph	4.5 s	5.8 s
0-200 km/h 0-124 mph	16.3 s	25.1 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	5.5 s	5.9 s
1/8 mile 201 m	8.2 s	9.0 s
1000 ft 305 m	10.6 s	11.8 s
1/4 mile 402 m	12.6 s	14.0 s
Trap speed 1/4 mile 402 m	180 km/h 112 mph	160 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	450 hp 336 kW
Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12	460 hp 343 kW

Rolls-Royce Phantom Drophead Coupe Facelift 2012 6.7 V12 has 10 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 Facelift 2012 6.7 V12: 10 hp (7 kW).

Torque comparison

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

Chart data table
Vehicle	Value
BMW6 Series Convertible (F12)650i	650 Nm 479 lb-ft
Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 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	1,980 kg 4,365 lb
Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12	2,630 kg 5,798 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 CoupeFacelift 20126.7 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	4.5 s
Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12	5.8 s

Although Rolls-Royce Phantom Drophead Coupe Facelift 2012 6.7 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 Facelift 2012 6.7 V12: 1.3 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	9.5 L/100 km 24.8 mpg US 29.7 mpg UK
Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12	14.8 L/100 km 15.9 mpg US 19.1 mpg UK

The biggest fuel consumption difference is between BMW 6 Series Convertible (F12) 650i and Rolls-Royce Phantom Drophead Coupe Facelift 2012 6.7 V12: 5.3 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	227 hp/t 169 kW/t 4.4 kg/hp
Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12	175 hp/t 130 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	737 km 458 mi
Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12	541 km 336 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	450 hp 336 kW	4.5 s	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph
Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12	460 hp 343 kW	5.8 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	450 hp 336 kW
0-100 km/h	4.5 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 CoupeFacelift 20126.7 V12

Power	460 hp 343 kW
0-100 km/h	5.8 s
Top speed Unrestricted 250 km/h155 mph Restricted 240 km/h149 mph

Doors/seats	2 doors 4 seats
Trunk	395 L 13.9 cu ft
Length	5,612 mm 220.9 in
Height	1,566 mm 61.7 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	450 hp 336 kW
0-100 km/h	4.5 s
Top speed Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph

9.5 L/100 km

24.8 mpg US

29.7 mpg UK

Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12

Power	460 hp 343 kW
0-100 km/h	5.8 s
Top speed Unrestricted 250 km/h155 mph Restricted 240 km/h149 mph

14.8 L/100 km

15.9 mpg US

19.1 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	9.5 L/100 km 24.8 mpg US 29.7 mpg UK	4.5 s
Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12	14.8 L/100 km 15.9 mpg US 19.1 mpg UK	5.8 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	227 hp/t 169 kW/t 4.4 kg/hp	9.5 L/100 km 24.8 mpg US 29.7 mpg UK
Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12	175 hp/t 130 kW/t 5.7 kg/hp	14.8 L/100 km 15.9 mpg US 19.1 mpg UK

Detailed score breakdown

Vehicle

BMW6 Series Convertible (F12)650i

Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12

Power

450 hp

336 kW

460 hp

343 kW

Torque

650 Nm

479 lb-ft

720 Nm

531 lb-ft

Acceleration

4.5 s

5.8 s

Top speed

Unrestricted

260 km/h162 mph

Restricted

250 km/h155 mph

Unrestricted

250 km/h155 mph

Restricted

240 km/h149 mph

Lightness

1,980 kg

4,365 lb

2,630 kg

5,798 lb

Fuel consumption

9.5 L/100 km

24.8 mpg US

29.7 mpg UK

14.8 L/100 km

15.9 mpg US

19.1 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 4 seats
Trunk	395 L 13.9 cu ft
Length	5,612 mm 220.9 in
Height	1,566 mm 61.7 in

Range score

737 km

458 mi

541 km

336 mi

CO2 score

221 g/km

347 g/km

Trunk score

300 L

10.6 cu ft

395 L

13.9 cu ft

Power-to-weight score

227 hp/t

169 kW/t

4.4 kg/hp

175 hp/t

130 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 Facelift 2012 6.7 V12
Consumption	9.5 L/100 km24.8 mpg US29.7 mpg UK	14.8 L/100 km15.9 mpg US19.1 mpg UK
Cost / 100 km	16.63 LC100 km	25.90 LC100 km
Cost / 100 mi	26.76 LC100 mi	41.68 LC100 mi
Annual fuel used	1,425 L376 US gal313 UK gal	2,220 L586 US gal488 UK gal
Annual fuel cost	2,494 LC/year	3,885 LC/year