Car comparison

Porsche 911 Cabriolet (991) Carrera 4 GTS 3.8vsRolls-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

Porsche 911 Cabriolet (991)

Carrera 4 GTS 3.8

430 hp3800 ccGasolineAWDManualNaturally aspiratedCabriolet / convertible2014-2015
VS

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.

Best choices

Porsche 911 Cabriolet (991) Carrera 4 GTS 3.8

  • Quickest 0-100 km/h
    4.6 s
  • Fastest top speed
    303 km/h
    188 mph
  • Lightest
    1,540 kg
    3,395 lb
  • Best power-to-weight
    279 hp/t
    208 kW/t
    3.6 kg/hp
  • Lowest combined fuel consumption
    10.0 L/100 km
    23.5 mpg US
    28.2 mpg UK
  • Lowest city consumption
    13.9 L/100 km
    16.9 mpg US
    20.3 mpg UK
  • Lowest highway consumption
    7.7 L/100 km
    30.5 mpg US
    36.7 mpg UK
  • Lowest CO2 emissions
    235 g/km
  • Best estimated range
    680 km
    423 mi
  • Best overall score
    68/100
  • Best performance score
    80/100
  • Best economy score
    80/100

Specification comparison

Specification comparison
ModelPorsche911 Cabriolet (991)Carrera 4 GTS 3.8Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12
Power
430hp321kW
460hp343kW
Torque
440Nm325lb-ft
720Nm531lb-ft
Curb weight
1,540kg3,395lb
2,630kg5,798lb
Gross weight
1,935kg4,266lb
3,050kg6,724lb
Top speed
303 km/h
188 mph
Unrestricted
250 km/h155 mph
Restricted
240 km/h149 mph
Calculated
To 99% top speed
65.2s99% target: 300 km/h / 186 mph
Calculated
96.2s99% target: 248 km/h / 154 mph
Calculated
0-100 km/h
4.6s
5.8s
0-200 km/h
13.5s
Calculated
25.1s
Calculated
0-60 mph
4.4s
Calculated
5.5s
Calculated
Fuel consumption
10L/100 km23.5mpg US28.2mpg UK
14.8L/100 km15.9mpg US19.1mpg UK
Fuel consumption city
13.9L/100 km16.9mpg US20.3mpg UK
22.8L/100 km10.3mpg US12.4mpg UK
Fuel consumption highway
7.7L/100 km30.5mpg US36.7mpg UK
10.2L/100 km23.1mpg US27.7mpg UK
Quarter mile
12.5s
Calculated
14.0s
Calculated
Power-to-weight
279hp/t208kW/t127hp/1000 lb
Calculated
175hp/t130kW/t79hp/1000 lb
Calculated
Torque-to-weight
286Nm/t191lb-ft/ton
Calculated
274Nm/t183lb-ft/ton
Calculated
Estimated range
680km423mi
Calculated
541km336mi
Calculated
Displacement
3,800cc232cu in
6,749cc412cu in
Length
4,509mm178in
5,612mm221in
Width
1,852mm73in
1,987mm78in
Height
1,294mm51in
1,566mm62in
Wheelbase
2,450mm96in
3,320mm131in
Front track
1,538mm61in
1,686mm66in
Rear track
1,560mm61in
1,676mm66in
Trunk volume
285L
395L
Doors
2
2
Seats
4
4
Fuel tank
68L
80L
CO2 emissions
235g/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.

Porsche 911 Cabriolet (991) Carrera 4 GTS 3.8Rolls-Royce Phantom Drophead Coupe Facelift 2012 6.7 V12PowerTorque
  • Porsche 911 Cabriolet (991) Carrera 4 GTS 3.8: Power / Torque
  • Rolls-Royce Phantom Drophead Coupe Facelift 2012 6.7 V12: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
Porsche911 Cabriolet (991)Carrera 4 GTS 3.87,500 rpm5,750 rpm7,750 rpm
Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V125,350 rpm3,500 rpm5,600 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricPorsche911 Cabriolet (991)Carrera 4 GTS 3.8Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12
Acceleration checkpoints
0-60 mph
0-97 km/h
4.4 s
5.5 s
0-100 km/h
0-62 mph
4.6 s
5.8 s
0-200 km/h
0-124 mph
13.5 s
25.1 s
Top speed
303 km/h
188 mph
Unrestricted
250 km/h155 mph
Restricted
240 km/h149 mph
Likely limited
Drag race simulation
60 ft
18 m
2.2 s
2.2 s
330 ft
101 m
5.6 s
5.9 s
1/8 mile
201 m
8.3 s
9.0 s
1000 ft
305 m
10.6 s
11.8 s
1/4 mile
402 m
12.5 s
14.0 s
Trap speed
1/4 mile
402 m
192 km/h
119 mph
160 km/h
99 mph

Power comparison

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

Chart data table
VehicleValue
Porsche911 Cabriolet (991)Carrera 4 GTS 3.8
430 hp
321 kW
Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12
460 hp
343 kW

Rolls-Royce Phantom Drophead Coupe Facelift 2012 6.7 V12 has 30 hp more than Porsche 911 Cabriolet (991) Carrera 4 GTS 3.8.

The biggest power difference is between Porsche 911 Cabriolet (991) Carrera 4 GTS 3.8 and Rolls-Royce Phantom Drophead Coupe Facelift 2012 6.7 V12: 30 hp (22 kW).

Torque comparison

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

Chart data table
VehicleValue
Porsche911 Cabriolet (991)Carrera 4 GTS 3.8
440 Nm
325 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
VehicleValue
Porsche911 Cabriolet (991)Carrera 4 GTS 3.8
1,540 kg
3,395 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
VehicleValue
Porsche911 Cabriolet (991)Carrera 4 GTS 3.8
303 km/h
188 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
VehicleValue
Porsche911 Cabriolet (991)Carrera 4 GTS 3.84.6 s
Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V125.8 s

Although Rolls-Royce Phantom Drophead Coupe Facelift 2012 6.7 V12 has more power, Porsche 911 Cabriolet (991) Carrera 4 GTS 3.8 is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between Porsche 911 Cabriolet (991) Carrera 4 GTS 3.8 and Rolls-Royce Phantom Drophead Coupe Facelift 2012 6.7 V12: 1.2 s.

Fuel consumption comparison

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

Chart data table
VehicleValue
Porsche911 Cabriolet (991)Carrera 4 GTS 3.8
10.0 L/100 km
23.5 mpg US
28.2 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 Porsche 911 Cabriolet (991) Carrera 4 GTS 3.8 and Rolls-Royce Phantom Drophead Coupe Facelift 2012 6.7 V12: 4.8 L/100 km.

Power-to-weight comparison

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

Chart data table
VehicleValue
Porsche911 Cabriolet (991)Carrera 4 GTS 3.8
279 hp/t
208 kW/t
3.6 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
VehicleValue
Porsche911 Cabriolet (991)Carrera 4 GTS 3.8
680 km
423 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
VehiclePowerAccelerationTop speed
Porsche911 Cabriolet (991)Carrera 4 GTS 3.8
430 hp
321 kW
4.6 s
303 km/h
188 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.

Chart data table
VehiclePerformance scorePracticality score
Porsche911 Cabriolet (991)Carrera 4 GTS 3.8
Power
430 hp
321 kW
0-100 km/h4.6 s
Top speed
303 km/h
188 mph
Doors/seats
2 doors
4 seats
Trunk
285 L
10.1 cu ft
Length
4,509 mm
177.5 in
Height
1,294 mm
50.9 in
Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12
Power
460 hp
343 kW
0-100 km/h5.8 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.

Performance vs fuel economy data table
VehiclePerformance scoreFuel economy score
Porsche911 Cabriolet (991)Carrera 4 GTS 3.8
Power
430 hp
321 kW
0-100 km/h4.6 s
Top speed
303 km/h
188 mph
10.0 L/100 km
23.5 mpg US
28.2 mpg UK
Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12
Power
460 hp
343 kW
0-100 km/h5.8 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

Porsche 911 Cabriolet (991) Carrera 4 GTS 3.8 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
VehicleFuel consumption, L/100 km0-100 km/h, s
Porsche911 Cabriolet (991)Carrera 4 GTS 3.8
10.0 L/100 km
23.5 mpg US
28.2 mpg UK
4.6 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
VehiclePower-to-weight, hp/tFuel consumption, L/100 km
Porsche911 Cabriolet (991)Carrera 4 GTS 3.8
279 hp/t
208 kW/t
3.6 kg/hp
10.0 L/100 km
23.5 mpg US
28.2 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

Detailed score breakdown
VehiclePorsche911 Cabriolet (991)Carrera 4 GTS 3.8Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12
Power
430 hp
321 kW
460 hp
343 kW
Torque
440 Nm
325 lb-ft
720 Nm
531 lb-ft
Acceleration
4.6 s
5.8 s
Top speed
303 km/h
188 mph
Unrestricted
250 km/h155 mph
Restricted
240 km/h149 mph
Lightness
1,540 kg
3,395 lb
2,630 kg
5,798 lb
Fuel consumption
10.0 L/100 km
23.5 mpg US
28.2 mpg UK
14.8 L/100 km
15.9 mpg US
19.1 mpg UK
Practicality
Doors/seats
2 doors
4 seats
Trunk
285 L
10.1 cu ft
Length
4,509 mm
177.5 in
Height
1,294 mm
50.9 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
680 km
423 mi
541 km
336 mi
CO2 score
235 g/km
347 g/km
Trunk score
285 L
10.1 cu ft
395 L
13.9 cu ft
Power-to-weight score
279 hp/t
208 kW/t
3.6 kg/hp
175 hp/t
130 kW/t
5.7 kg/hp
Overall
Fixed score
Fixed score

Fuel cost and annual usage

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

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
VehiclePorsche 911 Cabriolet (991) Carrera 4 GTS 3.8Rolls-Royce Phantom Drophead Coupe Facelift 2012 6.7 V12
Consumption10 L/100 km23.5 mpg US28.2 mpg UK14.8 L/100 km15.9 mpg US19.1 mpg UK
Cost / 100 km17.50 LC100 km25.90 LC100 km
Cost / 100 mi28.16 LC100 mi41.68 LC100 mi
Annual fuel used1,500 L396 US gal330 UK gal2,220 L586 US gal488 UK gal
Annual fuel cost2,625 LC/year3,885 LC/year

Head-to-head comparisons

Porsche 911 Cabriolet (991) Carrera 4 GTS 3.8

  • Is 1,090 kg lighter
  • Is 1.2 s quicker from 0-100 km/h
  • Has 53 km/h (33 mph) higher top speed
  • Uses 4.8 L/100 km less fuel
  • Has 104 hp/t better power-to-weight
  • Has 139 km (87 mi) more estimated range
  • Emits 112 g/km less CO2

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Lightest
  • Lowest combined fuel consumption
  • Best power-to-weight ratio
  • Best estimated range

Cons

  • Lowest power
  • Smallest trunk

Choose cars to compare

Brand
Model
Generation
Engine or modification
Porsche 911 Cabriolet (991) Carrera 4 GTS 3.8
Rolls-Royce Phantom Drophead Coupe 6.7 V12
Compare selected cars
2 vehicles selected

Popular comparisons

Carrera 4 GTS 3.8
Carrera 4S 3.0
VS
Porsche911 Cabriolet (991)Carrera 4 GTS 3.8vsPorsche911 Cabriolet (992)Carrera 4S 3.0
6.7 V12
4.2 FSI
VS
Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12vsAUDIRS5 Cabriolet (8T)Facelift 20134.2 FSI
Carrera 4 GTS 3.8
Turbo 3.8
VS
Porsche911 Cabriolet (991)Carrera 4 GTS 3.8vsPorsche911 Cabriolet (997)Facelift 2008Turbo 3.8
6.7 V12
650i
VS
Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12vsBMW6 Series Convertible (F12)650i
Carrera 4 GTS 3.8
Turbo 3.6
VS
Porsche911 Cabriolet (991)Carrera 4 GTS 3.8vsPorsche911 Cabriolet (997)Turbo 3.6
6.7 V12
Sport 4.7 V8
VS
Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12vsMaseratiGranCabrio ISport 4.7 V8
Carrera 4 GTS 3.8
Carrera 4 GTS 3.8
VS
Porsche911 Cabriolet (991)Carrera 4 GTS 3.8vsPorsche911 (991)Carrera 4 GTS 3.8
6.7 V12
S 500 V8
VS
Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12vsMercedes-BenzS-class Cabriolet (A217)S 500 V8
Carrera 4 GTS 3.8
4 GTS 3.8
VS
Porsche911 Cabriolet (991)Carrera 4 GTS 3.8vsPorsche911 Targa (991)4 GTS 3.8
6.7 V12
V8 4.0
VS
Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12vsBentleyContinental GTC IIV8 4.0
Carrera 4 GTS 3.8
Carrera T 3.0
VS
Porsche911 Cabriolet (991)Carrera 4 GTS 3.8vsPorsche911 Cabriolet (992)Facelift 2024Carrera T 3.0
6.7 V12
6.2 V8
VS
Rolls-RoycePhantom Drophead CoupeFacelift 20126.7 V12vsChevroletCamaro VI Convertible6.2 V8
Porsche 911 Cabriolet (991) Carrera 4 GTS 3.8 vs Rolls-Royce Phantom Drophead Coupe · Facelift 2012 6.7 V12 - car comparison - FastVsFaster