Car comparison

Jaguar XK Convertible (X150) 4.2 V8vsAlfa Romeo Spider (939) 3.2 JTS V6

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

New comparison

Jaguar XK Convertible (X150)

4.2 V8

298 hp4196 ccGasolineRWDAutomaticNaturally aspiratedCabriolet / convertible2006-2009
VS

Alfa Romeo Spider (939)

3.2 JTS V6

260 hp3195 ccGasolineFWDManualNaturally aspiratedCabriolet / convertible2008-2010

Comparison overview

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

Best choices

Jaguar XK Convertible (X150) 4.2 V8

  • Quickest 0-100 km/h
    6.3 s
  • Fastest top speed
    260 km/h
    162 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Most powerful
    298 hp
    222 kW
  • Highest torque
    411 Nm
    303 lb-ft
  • Best power-to-weight
    180 hp/t
    134 kW/t
    5.6 kg/hp
  • Best overall score
    56/100
  • Best performance score
    63/100
  • Best economy score
    77/100
  • Best practicality score
    41/100

Alfa Romeo Spider (939) 3.2 JTS V6

  • Lightest
    1,600 kg
    3,527 lb
  • Lowest combined fuel consumption
    11.1 L/100 km
    21.2 mpg US
    25.4 mpg UK
  • Lowest city consumption
    16.5 L/100 km
    14.3 mpg US
    17.1 mpg UK
  • Lowest highway consumption
    7.9 L/100 km
    29.8 mpg US
    35.8 mpg UK
  • Best estimated range
    631 km
    392 mi
  • Largest trunk
    253 L

Specification comparison

Specification comparison
ModelJaguarXK Convertible (X150)4.2 V8Alfa RomeoSpider (939)3.2 JTS V6
Power
298hp222kW
260hp194kW
Torque
411Nm303lb-ft
322Nm237lb-ft
Curb weight
1,660kg3,660lb
1,600kg3,527lb
Gross weight
2,075kg4,575lb
1,950kg4,299lb
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
250 km/h
155 mph
To 99% top speed
89.1s99% target: 257 km/h / 160 mph
Calculated
105.3s99% target: 248 km/h / 154 mph
Calculated
0-100 km/h
6.3s
7.2s
0-200 km/h
23.2s
Calculated
29.2s
Calculated
0-60 mph
6.0s
Calculated
6.8s
Calculated
Fuel consumption
11.3L/100 km20.8mpg US25.0mpg UK
11.1L/100 km21.2mpg US25.4mpg UK
Fuel consumption city
17.1L/100 km13.8mpg US16.5mpg UK
16.5L/100 km14.3mpg US17.1mpg UK
Fuel consumption highway
8.1L/100 km29mpg US34.9mpg UK
7.9L/100 km29.8mpg US35.8mpg UK
Quarter mile
14.4s
Calculated
15.1s
Calculated
Power-to-weight
180hp/t134kW/t81hp/1000 lb
Calculated
163hp/t121kW/t74hp/1000 lb
Calculated
Torque-to-weight
248Nm/t166lb-ft/ton
Calculated
201Nm/t135lb-ft/ton
Calculated
Estimated range
629km391mi
Calculated
631km392mi
Calculated
Displacement
4,196cc256cu in
3,195cc195cu in
Length
4,791mm189in
4,393mm173in
Width-
1,830mm72in
Height
1,329mm52in
1,318mm52in
Wheelbase
2,752mm108in
2,528mm100in
Front track-
1,579mm62in
Rear track-
1,559mm61in
Ground clearance
120mm5in
-
Trunk volume
200L
253L
Max trunk volume
283L
-
Doors
2
2
Seats
4
2
Fuel tank
71L
70L
CO2 emissions-
262g/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.

Jaguar XK Convertible (X150) 4.2 V8Alfa Romeo Spider (939) 3.2 JTS V6PowerTorque
  • Jaguar XK Convertible (X150) 4.2 V8: Power / Torque
  • Alfa Romeo Spider (939) 3.2 JTS V6: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
JaguarXK Convertible (X150)4.2 V86,000 rpm4,100 rpm6,250 rpm
Alfa RomeoSpider (939)3.2 JTS V66,300 rpm4,500 rpm6,550 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricJaguarXK Convertible (X150)4.2 V8Alfa RomeoSpider (939)3.2 JTS V6
Acceleration checkpoints
0-60 mph
0-97 km/h
6.0 s
6.8 s
0-100 km/h
0-62 mph
6.3 s
7.2 s
0-200 km/h
0-124 mph
23.2 s
29.2 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Limited
250 km/h
155 mph
Drag race simulation
60 ft
18 m
2.4 s
2.4 s
330 ft
101 m
6.3 s
6.5 s
1/8 mile
201 m
9.4 s
9.9 s
1000 ft
305 m
12.1 s
12.7 s
1/4 mile
402 m
14.4 s
15.1 s
Trap speed
1/4 mile
402 m
162 km/h
101 mph
152 km/h
95 mph

Power comparison

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

Chart data table
VehicleValue
JaguarXK Convertible (X150)4.2 V8
298 hp
222 kW
Alfa RomeoSpider (939)3.2 JTS V6
260 hp
194 kW

Jaguar XK Convertible (X150) 4.2 V8 has 38 hp more than Alfa Romeo Spider (939) 3.2 JTS V6.

The biggest power difference is between Alfa Romeo Spider (939) 3.2 JTS V6 and Jaguar XK Convertible (X150) 4.2 V8: 38 hp (28 kW).

Torque comparison

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

Chart data table
VehicleValue
JaguarXK Convertible (X150)4.2 V8
411 Nm
303 lb-ft
Alfa RomeoSpider (939)3.2 JTS V6
322 Nm
237 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
JaguarXK Convertible (X150)4.2 V8
1,660 kg
3,660 lb
Alfa RomeoSpider (939)3.2 JTS V6
1,600 kg
3,527 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
JaguarXK Convertible (X150)4.2 V8
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Alfa RomeoSpider (939)3.2 JTS V6
250 km/h
155 mph

0-100 km/h comparison

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

Chart data table
VehicleValue
JaguarXK Convertible (X150)4.2 V86.3 s
Alfa RomeoSpider (939)3.2 JTS V67.2 s

The biggest 0-100 km/h difference is between Jaguar XK Convertible (X150) 4.2 V8 and Alfa Romeo Spider (939) 3.2 JTS V6: 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
VehicleValue
JaguarXK Convertible (X150)4.2 V8
11.3 L/100 km
20.8 mpg US
25.0 mpg UK
Alfa RomeoSpider (939)3.2 JTS V6
11.1 L/100 km
21.2 mpg US
25.4 mpg UK

Power-to-weight comparison

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

Chart data table
VehicleValue
JaguarXK Convertible (X150)4.2 V8
180 hp/t
134 kW/t
5.6 kg/hp
Alfa RomeoSpider (939)3.2 JTS V6
163 hp/t
121 kW/t
6.2 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
JaguarXK Convertible (X150)4.2 V8
629 km
391 mi
Alfa RomeoSpider (939)3.2 JTS V6
631 km
392 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
JaguarXK Convertible (X150)4.2 V8
298 hp
222 kW
6.3 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Alfa RomeoSpider (939)3.2 JTS V6
260 hp
194 kW
7.2 s
250 km/h
155 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
JaguarXK Convertible (X150)4.2 V8
Power
298 hp
222 kW
0-100 km/h6.3 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk
200 L
7.1 cu ft
Length
4,791 mm
188.6 in
Height
1,329 mm
52.3 in
Alfa RomeoSpider (939)3.2 JTS V6
Power
260 hp
194 kW
0-100 km/h7.2 s
Top speed
250 km/h
155 mph
Doors/seats
2 doors
2 seats
Trunk
253 L
8.9 cu ft
Length
4,393 mm
173.0 in
Height
1,318 mm
51.9 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
JaguarXK Convertible (X150)4.2 V8
Power
298 hp
222 kW
0-100 km/h6.3 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
11.3 L/100 km
20.8 mpg US
25.0 mpg UK
Alfa RomeoSpider (939)3.2 JTS V6
Power
260 hp
194 kW
0-100 km/h7.2 s
Top speed
250 km/h
155 mph
11.1 L/100 km
21.2 mpg US
25.4 mpg UK

Jaguar XK Convertible (X150) 4.2 V8 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
JaguarXK Convertible (X150)4.2 V8
11.3 L/100 km
20.8 mpg US
25.0 mpg UK
6.3 s
Alfa RomeoSpider (939)3.2 JTS V6
11.1 L/100 km
21.2 mpg US
25.4 mpg UK
7.2 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
JaguarXK Convertible (X150)4.2 V8
180 hp/t
134 kW/t
5.6 kg/hp
11.3 L/100 km
20.8 mpg US
25.0 mpg UK
Alfa RomeoSpider (939)3.2 JTS V6
163 hp/t
121 kW/t
6.2 kg/hp
11.1 L/100 km
21.2 mpg US
25.4 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleJaguarXK Convertible (X150)4.2 V8Alfa RomeoSpider (939)3.2 JTS V6
Power
298 hp
222 kW
260 hp
194 kW
Torque
411 Nm
303 lb-ft
322 Nm
237 lb-ft
Acceleration
6.3 s
7.2 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
250 km/h
155 mph
Lightness
1,660 kg
3,660 lb
1,600 kg
3,527 lb
Fuel consumption
11.3 L/100 km
20.8 mpg US
25.0 mpg UK
11.1 L/100 km
21.2 mpg US
25.4 mpg UK
Practicality
Doors/seats
2 doors
4 seats
Trunk
200 L
7.1 cu ft
Length
4,791 mm
188.6 in
Height
1,329 mm
52.3 in
Doors/seats
2 doors
2 seats
Trunk
253 L
8.9 cu ft
Length
4,393 mm
173.0 in
Height
1,318 mm
51.9 in
Range score
629 km
391 mi
631 km
392 mi
CO2 score
-
262 g/km
Trunk score
200 L
7.1 cu ft
253 L
8.9 cu ft
Power-to-weight score
180 hp/t
134 kW/t
5.6 kg/hp
163 hp/t
121 kW/t
6.2 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
VehicleJaguar XK Convertible (X150) 4.2 V8Alfa Romeo Spider (939) 3.2 JTS V6
Consumption11.3 L/100 km20.8 mpg US25 mpg UK11.1 L/100 km21.2 mpg US25.4 mpg UK
Cost / 100 km19.78 LC100 km19.43 LC100 km
Cost / 100 mi31.82 LC100 mi31.26 LC100 mi
Annual fuel used1,695 L448 US gal373 UK gal1,665 L440 US gal366 UK gal
Annual fuel cost2,966 LC/year2,914 LC/year

Head-to-head comparisons

Jaguar XK Convertible (X150) 4.2 V8

  • Has 38 hp more
  • Has 89 Nm more
  • Is 0.9 s quicker from 0-100 km/h
  • Has 10 km/h (6 mph) higher top speed
  • Has 17 hp/t better power-to-weight

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Most powerful
  • Highest torque
  • Best power-to-weight ratio

Cons

  • Highest combined fuel consumption
  • Heaviest
  • Smallest trunk

Alfa Romeo Spider (939) 3.2 JTS V6

  • Is 60 kg lighter
  • Uses 0.2 L/100 km less fuel
  • Has 1 km (1 mi) more estimated range
  • Has 53 L more trunk volume

Pros

  • Lightest
  • Lowest combined fuel consumption
  • Best estimated range
  • Largest trunk

Cons

  • Slowest 0-100 km/h
  • Lowest power
  • Lowest top speed

Choose cars to compare

Brand
Model
Generation
Engine or modification
Jaguar XK Convertible (X150) 4.2 V8
Alfa Romeo Spider (939) 3.2 JTS V6
Compare selected cars
2 vehicles selected

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