Car comparison

BMW 6 Series Convertible (E64) 630ivsAlfa Romeo Spider (939) 3.2 JTS V6

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

New comparison

BMW 6 Series Convertible (E64)

630i

258 hp2996 ccGasolineRWDManualNaturally aspiratedCabriolet / convertible2004-2007

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.

BMW 6 Series Convertible (E64) 630i

Quickest 0-100 km/h
6.9 s
Fastest top speed
260 km/h
162 mph Unrestricted
250 km/h
155 mph Restricted
Lowest combined fuel consumption
9.6 L/100 km
24.5 mpg US
29.4 mpg UK
Lowest city consumption
13.6 L/100 km
17.3 mpg US
20.8 mpg UK
Lowest highway consumption
7.3 L/100 km
32.2 mpg US
38.7 mpg UK
Best estimated range
729 km
453 mi
Largest trunk
300 L
Best overall score
53/100
Best performance score
57/100
Best economy score
81/100
Best practicality score
45/100

Alfa Romeo Spider (939) 3.2 JTS V6

Most powerful
260 hp
194 kW
Highest torque
322 Nm
237 lb-ft
Lightest
1,600 kg
3,527 lb
Best power-to-weight
163 hp/t
121 kW/t
6.2 kg/hp

Specification comparison

Specification comparison
Model	BMW6 Series Convertible (E64)630i	Alfa RomeoSpider (939)3.2 JTS V6
Power	258hp192kW	260hp194kW
Torque	300Nm221lb-ft	322Nm237lb-ft
Curb weight	1,685kg3,715lb	1,600kg3,527lb
Gross weight	2,085kg4,597lb	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	101.6s99% target: 257 km/h / 160 mph Calculated	104.9s99% target: 248 km/h / 154 mph Calculated
0-100 km/h	6.9s	7.2s
0-200 km/h	25.9s Calculated	29.2s Calculated
0-60 mph	6.5s Calculated	6.8s Calculated
Fuel consumption	9.6L/100 km24.5mpg US29.4mpg UK	11.1L/100 km21.2mpg US25.4mpg UK
Fuel consumption city	13.6L/100 km17.3mpg US20.8mpg UK	16.5L/100 km14.3mpg US17.1mpg UK
Fuel consumption highway	7.3L/100 km32.2mpg US38.7mpg UK	7.9L/100 km29.8mpg US35.8mpg UK
Quarter mile	14.9s Calculated	15.1s Calculated
Power-to-weight	153hp/t114kW/t69hp/1000 lb Calculated	163hp/t121kW/t74hp/1000 lb Calculated
Torque-to-weight	178Nm/t119lb-ft/ton Calculated	201Nm/t135lb-ft/ton Calculated
Estimated range	729km453mi Calculated	631km392mi Calculated
Displacement	2,996cc183cu in	3,195cc195cu in
Length	4,820mm190in	4,393mm173in
Width	1,855mm73in	1,830mm72in
Height	1,373mm54in	1,318mm52in
Wheelbase	2,780mm109in	2,528mm100in
Front track	1,558mm61in	1,579mm62in
Rear track	1,596mm63in	1,559mm61in
Trunk volume	300L	253L
Max trunk volume	350L	-
Doors	2	2
Seats	4	2
Fuel tank	70L	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.

BMW 6 Series Convertible (E64) 630iAlfa Romeo Spider (939) 3.2 JTS V6PowerTorque

Dyno simulation data table
Vehicle	Peak power RPM	Peak torque RPM	Max engine speed
BMW6 Series Convertible (E64)630i	6,600 rpm	2,500 rpm	6,850 rpm
Alfa RomeoSpider (939)3.2 JTS V6	6,300 rpm	4,500 rpm	6,550 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
Metric	BMW6 Series Convertible (E64)630i	Alfa RomeoSpider (939)3.2 JTS V6
	Acceleration checkpoints
0-60 mph 0-97 km/h	6.5 s	6.8 s
0-100 km/h 0-62 mph	6.9 s	7.2 s
0-200 km/h 0-124 mph	25.9 s	29.2 s
Top speed	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Likely limited	250 km/h 155 mph
	Drag race simulation
60 ft 18 m	2.4 s	2.4 s
330 ft 101 m	6.5 s	6.5 s
1/8 mile 201 m	9.7 s	9.9 s
1000 ft 305 m	12.5 s	12.7 s
1/4 mile 402 m	14.9 s	15.1 s
Trap speed 1/4 mile 402 m	157 km/h 97 mph	152 km/h 95 mph

Power comparison

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

Chart data table
Vehicle	Value
BMW6 Series Convertible (E64)630i	258 hp 192 kW
Alfa RomeoSpider (939)3.2 JTS V6	260 hp 194 kW

Alfa Romeo Spider (939) 3.2 JTS V6 has 2 hp more than BMW 6 Series Convertible (E64) 630i.

The biggest power difference is between BMW 6 Series Convertible (E64) 630i and Alfa Romeo Spider (939) 3.2 JTS V6: 2 hp (1 kW).

Torque comparison

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

Chart data table
Vehicle	Value
BMW6 Series Convertible (E64)630i	300 Nm 221 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
Vehicle	Value
BMW6 Series Convertible (E64)630i	1,685 kg 3,715 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
Vehicle	Value
BMW6 Series Convertible (E64)630i	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
Vehicle	Value
BMW6 Series Convertible (E64)630i	6.9 s
Alfa RomeoSpider (939)3.2 JTS V6	7.2 s

Although Alfa Romeo Spider (939) 3.2 JTS V6 has more power, BMW 6 Series Convertible (E64) 630i is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between BMW 6 Series Convertible (E64) 630i and Alfa Romeo Spider (939) 3.2 JTS V6: 0.3 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 (E64)630i	9.6 L/100 km 24.5 mpg US 29.4 mpg UK
Alfa RomeoSpider (939)3.2 JTS V6	11.1 L/100 km 21.2 mpg US 25.4 mpg UK

The biggest fuel consumption difference is between BMW 6 Series Convertible (E64) 630i and Alfa Romeo Spider (939) 3.2 JTS V6: 1.5 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 (E64)630i	153 hp/t 114 kW/t 6.5 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
Vehicle	Value
BMW6 Series Convertible (E64)630i	729 km 453 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
Vehicle	Power	Acceleration	Top speed
BMW6 Series Convertible (E64)630i	258 hp 192 kW	6.9 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.

Vehicle

Performance score

Practicality score

BMW6 Series Convertible (E64)630i

Power	258 hp 192 kW
0-100 km/h	6.9 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	4,820 mm 189.8 in
Height	1,373 mm 54.1 in

Alfa RomeoSpider (939)3.2 JTS V6

Power	260 hp 194 kW
0-100 km/h	7.2 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.

Vehicle

Performance score

Fuel economy score

BMW6 Series Convertible (E64)630i

Power	258 hp 192 kW
0-100 km/h	6.9 s
Top speed Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph

9.6 L/100 km

24.5 mpg US

29.4 mpg UK

Alfa RomeoSpider (939)3.2 JTS V6

Power	260 hp 194 kW
0-100 km/h	7.2 s
Top speed 250 km/h 155 mph

11.1 L/100 km

21.2 mpg US

25.4 mpg UK

BMW 6 Series Convertible (E64) 630i 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 (E64)630i	9.6 L/100 km 24.5 mpg US 29.4 mpg UK	6.9 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
Vehicle	Power-to-weight, hp/t	Fuel consumption, L/100 km
BMW6 Series Convertible (E64)630i	153 hp/t 114 kW/t 6.5 kg/hp	9.6 L/100 km 24.5 mpg US 29.4 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

Vehicle

BMW6 Series Convertible (E64)630i

Alfa RomeoSpider (939)3.2 JTS V6

Power

258 hp

192 kW

260 hp

194 kW

Torque

300 Nm

221 lb-ft

322 Nm

237 lb-ft

Acceleration

6.9 s

7.2 s

Top speed

Unrestricted

260 km/h162 mph

Restricted

250 km/h155 mph

250 km/h

155 mph

Lightness

1,685 kg

3,715 lb

1,600 kg

3,527 lb

Fuel consumption

9.6 L/100 km

24.5 mpg US

29.4 mpg UK

11.1 L/100 km

21.2 mpg US

25.4 mpg UK

Practicality

Doors/seats	2 doors 4 seats
Trunk	300 L 10.6 cu ft
Length	4,820 mm 189.8 in
Height	1,373 mm 54.1 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

729 km

453 mi

631 km

392 mi

CO2 score

262 g/km

Trunk score

300 L

10.6 cu ft

253 L

8.9 cu ft

Power-to-weight score

153 hp/t

114 kW/t

6.5 kg/hp

163 hp/t

121 kW/t

6.2 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 (E64) 630i	Alfa Romeo Spider (939) 3.2 JTS V6
Consumption	9.6 L/100 km24.5 mpg US29.4 mpg UK	11.1 L/100 km21.2 mpg US25.4 mpg UK
Cost / 100 km	16.80 LC100 km	19.43 LC100 km
Cost / 100 mi	27.04 LC100 mi	31.26 LC100 mi
Annual fuel used	1,440 L380 US gal317 UK gal	1,665 L440 US gal366 UK gal
Annual fuel cost	2,520 LC/year	2,914 LC/year