Car comparison

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

Alfa Romeo Spider (939)

3.2 V6

260 hp3195 ccGasolineAWDAutomaticNaturally aspiratedCabriolet / convertible2006-2010

Comparison overview

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

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
Lightest
1,660 kg
3,660 lb
Best power-to-weight
180 hp/t
134 kW/t
5.6 kg/hp
Lowest combined fuel consumption
11.3 L/100 km
20.8 mpg US
25.0 mpg UK
Best estimated range
629 km
391 mi
Best overall score
56/100
Best performance score
63/100
Best economy score
77/100

Alfa Romeo Spider (939) 3.2 V6

Largest trunk
253 L
Best practicality score
42/100

Specification comparison

Specification comparison
Model	JaguarXK Convertible (X150)4.2 V8	Alfa RomeoSpider (939)3.2 V6
Power	298hp222kW	260hp194kW
Torque	411Nm303lb-ft	322Nm237lb-ft
Curb weight	1,660kg3,660lb	1,765kg3,891lb
Gross weight	2,075kg4,575lb	-
Top speed	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Calculated	240 km/h 149 mph
To 99% top speed	89.1s99% target: 257 km/h / 160 mph Calculated	100.0s99% target: 238 km/h / 148 mph Calculated
0-100 km/h	6.3s	7.0s
0-200 km/h	23.2s Calculated	31.0s Calculated
0-60 mph	6.0s Calculated	6.6s Calculated
Fuel consumption	11.3L/100 km20.8mpg US25.0mpg UK	12.2L/100 km19.3mpg US23.2mpg UK
Fuel consumption city	17.1L/100 km13.8mpg US16.5mpg UK	-
Fuel consumption highway	8.1L/100 km29mpg US34.9mpg UK	-
Quarter mile	14.4s Calculated	15.0s Calculated
Power-to-weight	180hp/t134kW/t81hp/1000 lb Calculated	147hp/t110kW/t67hp/1000 lb Calculated
Torque-to-weight	248Nm/t166lb-ft/ton Calculated	182Nm/t122lb-ft/ton Calculated
Estimated range	629km391mi Calculated	574km357mi 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	4
Fuel tank	71L	70L

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 V6PowerTorque

Dyno simulation data table
Vehicle	Peak power RPM	Peak torque RPM	Max engine speed
JaguarXK Convertible (X150)4.2 V8	6,000 rpm	4,100 rpm	6,250 rpm
Alfa RomeoSpider (939)3.2 V6	6,200 rpm	4,500 rpm	6,450 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
Metric	JaguarXK Convertible (X150)4.2 V8	Alfa RomeoSpider (939)3.2 V6
	Acceleration checkpoints
0-60 mph 0-97 km/h	6.0 s	6.6 s
0-100 km/h 0-62 mph	6.3 s	7.0 s
0-200 km/h 0-124 mph	23.2 s	31.0 s
Top speed	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Limited	240 km/h 149 mph
	Drag race simulation
60 ft 18 m	2.4 s	2.4 s
330 ft 101 m	6.3 s	6.4 s
1/8 mile 201 m	9.4 s	9.7 s
1000 ft 305 m	12.1 s	12.6 s
1/4 mile 402 m	14.4 s	15.0 s
Trap speed 1/4 mile 402 m	162 km/h 101 mph	151 km/h 94 mph

Power comparison

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

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

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

The biggest power difference is between Alfa Romeo Spider (939) 3.2 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
Vehicle	Value
JaguarXK Convertible (X150)4.2 V8	411 Nm 303 lb-ft
Alfa RomeoSpider (939)3.2 V6	322 Nm 237 lb-ft

Curb weight comparison

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

Chart data table
Vehicle	Value
JaguarXK Convertible (X150)4.2 V8	1,660 kg 3,660 lb
Alfa RomeoSpider (939)3.2 V6	1,765 kg 3,891 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
JaguarXK Convertible (X150)4.2 V8	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph
Alfa RomeoSpider (939)3.2 V6	240 km/h 149 mph

0-100 km/h comparison

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

Chart data table
Vehicle	Value
JaguarXK Convertible (X150)4.2 V8	6.3 s
Alfa RomeoSpider (939)3.2 V6	7.0 s

The biggest 0-100 km/h difference is between Jaguar XK Convertible (X150) 4.2 V8 and Alfa Romeo Spider (939) 3.2 V6: 0.7 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
JaguarXK Convertible (X150)4.2 V8	11.3 L/100 km 20.8 mpg US 25.0 mpg UK
Alfa RomeoSpider (939)3.2 V6	12.2 L/100 km 19.3 mpg US 23.2 mpg UK

The biggest fuel consumption difference is between Jaguar XK Convertible (X150) 4.2 V8 and Alfa Romeo Spider (939) 3.2 V6: 0.9 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
JaguarXK Convertible (X150)4.2 V8	180 hp/t 134 kW/t 5.6 kg/hp
Alfa RomeoSpider (939)3.2 V6	147 hp/t 110 kW/t 6.8 kg/hp

Estimated range comparison

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

Chart data table
Vehicle	Value
JaguarXK Convertible (X150)4.2 V8	629 km 391 mi
Alfa RomeoSpider (939)3.2 V6	574 km 357 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
Vehicle	Power	Acceleration	Top 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 V6	260 hp 194 kW	7.0 s	240 km/h 149 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

JaguarXK Convertible (X150)4.2 V8

Power	298 hp 222 kW
0-100 km/h	6.3 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 V6

Power	260 hp 194 kW
0-100 km/h	7.0 s
Top speed 240 km/h 149 mph

Doors/seats	2 doors 4 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.

Vehicle

Performance score

Fuel economy score

JaguarXK Convertible (X150)4.2 V8

Power	298 hp 222 kW
0-100 km/h	6.3 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 V6

Power	260 hp 194 kW
0-100 km/h	7.0 s
Top speed 240 km/h 149 mph

12.2 L/100 km

19.3 mpg US

23.2 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
Vehicle	Fuel consumption, L/100 km	0-100 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 V6	12.2 L/100 km 19.3 mpg US 23.2 mpg UK	7.0 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
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 V6	147 hp/t 110 kW/t 6.8 kg/hp	12.2 L/100 km 19.3 mpg US 23.2 mpg UK

Detailed score breakdown

Vehicle

JaguarXK Convertible (X150)4.2 V8

Alfa RomeoSpider (939)3.2 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

7.0 s

Top speed

Unrestricted

260 km/h162 mph

Restricted

250 km/h155 mph

240 km/h

149 mph

Lightness

1,660 kg

3,660 lb

1,765 kg

3,891 lb

Fuel consumption

11.3 L/100 km

20.8 mpg US

25.0 mpg UK

12.2 L/100 km

19.3 mpg US

23.2 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 4 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

574 km

357 mi

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

147 hp/t

110 kW/t

6.8 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	Jaguar XK Convertible (X150) 4.2 V8	Alfa Romeo Spider (939) 3.2 V6
Consumption	11.3 L/100 km20.8 mpg US25 mpg UK	12.2 L/100 km19.3 mpg US23.2 mpg UK
Cost / 100 km	19.78 LC100 km	21.35 LC100 km
Cost / 100 mi	31.82 LC100 mi	34.36 LC100 mi
Annual fuel used	1,695 L448 US gal373 UK gal	1,830 L483 US gal403 UK gal
Annual fuel cost	2,966 LC/year	3,203 LC/year