Car comparison

BMW 6 Series Convertible (E64) 645CivsChrysler Crossfire Roadster SRT-6 3.2i V6

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

New comparison

BMW 6 Series Convertible (E64)

645Ci

333 hp4398 ccGasolineRWDManualNaturally aspiratedCabriolet / convertible2003-2005

Chrysler Crossfire Roadster

SRT-6 3.2i V6

330 hp3199 ccGasolineRWDAutomaticSuperchargedCabriolet / convertible2004-2006

Comparison overview

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

Chrysler Crossfire Roadster SRT-6 3.2i V6

Quickest 0-100 km/h
5.3 s
Lightest
1,495 kg
3,296 lb
Best power-to-weight
221 hp/t
165 kW/t
4.5 kg/hp
Lowest combined fuel consumption
11.0 L/100 km
21.4 mpg US
25.7 mpg UK
Lowest city consumption
15.9 L/100 km
14.8 mpg US
17.8 mpg UK
Lowest highway consumption
8.2 L/100 km
28.7 mpg US
34.4 mpg UK
Best estimated range
545 km
339 mi
Best performance score
68/100
Best economy score
77/100

BMW 6 Series Convertible (E64) 645Ci

Fastest top speed
260 km/h
162 mph Unrestricted
250 km/h
155 mph Restricted
Most powerful
333 hp
248 kW
Highest torque
450 Nm
332 lb-ft
Largest trunk
300 L
Best overall score
59/100
Best practicality score
45/100

Specification comparison

Specification comparison
Model	BMW6 Series Convertible (E64)645Ci	ChryslerCrossfire RoadsterSRT-6 3.2i V6
Power	333hp248kW	330hp246kW
Torque	450Nm332lb-ft	420Nm310lb-ft
Curb weight	1,815kg4,001lb	1,495kg3,296lb
Gross weight	2,215kg4,883lb	1,755kg3,869lb
Top speed	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Calculated	255 km/h 158 mph
To 99% top speed	87.6s99% target: 257 km/h / 160 mph Calculated	64.6s99% target: 252 km/h / 157 mph Calculated
0-100 km/h	6.1s	5.3s
0-200 km/h	22.6s Calculated	18.8s Calculated
0-60 mph	5.8s Calculated	5.0s Calculated
Fuel consumption	12.9L/100 km18.2mpg US21.9mpg UK	11L/100 km21.4mpg US25.7mpg UK
Fuel consumption city	18.5L/100 km12.7mpg US15.3mpg UK	15.9L/100 km14.8mpg US17.8mpg UK
Fuel consumption highway	9.6L/100 km24.5mpg US29.4mpg UK	8.2L/100 km28.7mpg US34.4mpg UK
Quarter mile	14.2s Calculated	13.4s Calculated
Power-to-weight	183hp/t137kW/t83hp/1000 lb Calculated	221hp/t165kW/t100hp/1000 lb Calculated
Torque-to-weight	248Nm/t166lb-ft/ton Calculated	281Nm/t188lb-ft/ton Calculated
Estimated range	543km337mi Calculated	545km339mi Calculated
Displacement	4,398cc268cu in	3,199cc195cu in
Length	4,820mm190in	4,060mm160in
Width	1,855mm73in	1,765mm69in
Height	1,373mm54in	1,305mm51in
Wheelbase	2,780mm109in	2,400mm94in
Front track	1,558mm61in	1,495mm59in
Rear track	1,592mm63in	1,500mm59in
Trunk volume	300L	105L
Max trunk volume	350L	190L
Doors	2	2
Seats	4	2
Fuel tank	70L	60L
CO2 emissions	-	264g/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) 645CiChrysler Crossfire Roadster SRT-6 3.2i V6PowerTorque

Dyno simulation data table
Vehicle	Peak power RPM	Peak torque RPM	Max engine speed
BMW6 Series Convertible (E64)645Ci	6,100 rpm	3,600 rpm	6,350 rpm
ChryslerCrossfire RoadsterSRT-6 3.2i V6	6,100 rpm	3,500 rpm	6,350 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
Metric	BMW6 Series Convertible (E64)645Ci	ChryslerCrossfire RoadsterSRT-6 3.2i V6
	Acceleration checkpoints
0-60 mph 0-97 km/h	5.8 s	5.0 s
0-100 km/h 0-62 mph	6.1 s	5.3 s
0-200 km/h 0-124 mph	22.6 s	18.8 s
Top speed	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Likely limited	255 km/h 158 mph
	Drag race simulation
60 ft 18 m	2.3 s	2.3 s
330 ft 101 m	6.2 s	5.9 s
1/8 mile 201 m	9.3 s	8.8 s
1000 ft 305 m	12.0 s	11.3 s
1/4 mile 402 m	14.2 s	13.4 s
Trap speed 1/4 mile 402 m	163 km/h 102 mph	173 km/h 108 mph

Power comparison

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

Chart data table
Vehicle	Value
BMW6 Series Convertible (E64)645Ci	333 hp 248 kW
ChryslerCrossfire RoadsterSRT-6 3.2i V6	330 hp 246 kW

BMW 6 Series Convertible (E64) 645Ci has 3 hp more than Chrysler Crossfire Roadster SRT-6 3.2i V6.

The biggest power difference is between Chrysler Crossfire Roadster SRT-6 3.2i V6 and BMW 6 Series Convertible (E64) 645Ci: 3 hp (2 kW).

Torque comparison

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

Chart data table
Vehicle	Value
BMW6 Series Convertible (E64)645Ci	450 Nm 332 lb-ft
ChryslerCrossfire RoadsterSRT-6 3.2i V6	420 Nm 310 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)645Ci	1,815 kg 4,001 lb
ChryslerCrossfire RoadsterSRT-6 3.2i V6	1,495 kg 3,296 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)645Ci	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph
ChryslerCrossfire RoadsterSRT-6 3.2i V6	255 km/h 158 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)645Ci	6.1 s
ChryslerCrossfire RoadsterSRT-6 3.2i V6	5.3 s

Although BMW 6 Series Convertible (E64) 645Ci has more power, Chrysler Crossfire Roadster SRT-6 3.2i V6 is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between Chrysler Crossfire Roadster SRT-6 3.2i V6 and BMW 6 Series Convertible (E64) 645Ci: 0.8 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)645Ci	12.9 L/100 km 18.2 mpg US 21.9 mpg UK
ChryslerCrossfire RoadsterSRT-6 3.2i V6	11.0 L/100 km 21.4 mpg US 25.7 mpg UK

The biggest fuel consumption difference is between Chrysler Crossfire Roadster SRT-6 3.2i V6 and BMW 6 Series Convertible (E64) 645Ci: 1.9 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
BMW6 Series Convertible (E64)645Ci	183 hp/t 137 kW/t 5.5 kg/hp
ChryslerCrossfire RoadsterSRT-6 3.2i V6	221 hp/t 165 kW/t 4.5 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)645Ci	543 km 337 mi
ChryslerCrossfire RoadsterSRT-6 3.2i V6	545 km 339 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)645Ci	333 hp 248 kW	6.1 s	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph
ChryslerCrossfire RoadsterSRT-6 3.2i V6	330 hp 246 kW	5.3 s	255 km/h 158 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)645Ci

Power	333 hp 248 kW
0-100 km/h	6.1 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

ChryslerCrossfire RoadsterSRT-6 3.2i V6

Power	330 hp 246 kW
0-100 km/h	5.3 s
Top speed 255 km/h 158 mph

Doors/seats	2 doors 2 seats
Trunk	105 L 3.7 cu ft
Length	4,060 mm 159.8 in
Height	1,305 mm 51.4 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)645Ci

Power	333 hp 248 kW
0-100 km/h	6.1 s
Top speed Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph

12.9 L/100 km

18.2 mpg US

21.9 mpg UK

ChryslerCrossfire RoadsterSRT-6 3.2i V6

Power	330 hp 246 kW
0-100 km/h	5.3 s
Top speed 255 km/h 158 mph

11.0 L/100 km

21.4 mpg US

25.7 mpg UK

Chrysler Crossfire Roadster SRT-6 3.2i V6 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)645Ci	12.9 L/100 km 18.2 mpg US 21.9 mpg UK	6.1 s
ChryslerCrossfire RoadsterSRT-6 3.2i V6	11.0 L/100 km 21.4 mpg US 25.7 mpg UK	5.3 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)645Ci	183 hp/t 137 kW/t 5.5 kg/hp	12.9 L/100 km 18.2 mpg US 21.9 mpg UK
ChryslerCrossfire RoadsterSRT-6 3.2i V6	221 hp/t 165 kW/t 4.5 kg/hp	11.0 L/100 km 21.4 mpg US 25.7 mpg UK

Detailed score breakdown

Vehicle

BMW6 Series Convertible (E64)645Ci

ChryslerCrossfire RoadsterSRT-6 3.2i V6

Power

333 hp

248 kW

330 hp

246 kW

Torque

450 Nm

332 lb-ft

420 Nm

310 lb-ft

Acceleration

6.1 s

5.3 s

Top speed

Unrestricted

260 km/h162 mph

Restricted

250 km/h155 mph

255 km/h

158 mph

Lightness

1,815 kg

4,001 lb

1,495 kg

3,296 lb

Fuel consumption

12.9 L/100 km

18.2 mpg US

21.9 mpg UK

11.0 L/100 km

21.4 mpg US

25.7 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	105 L 3.7 cu ft
Length	4,060 mm 159.8 in
Height	1,305 mm 51.4 in

Range score

543 km

337 mi

545 km

339 mi

CO2 score

264 g/km

Trunk score

300 L

10.6 cu ft

105 L

3.7 cu ft

Power-to-weight score

183 hp/t

137 kW/t

5.5 kg/hp

221 hp/t

165 kW/t

4.5 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) 645Ci	Chrysler Crossfire Roadster SRT-6 3.2i V6
Consumption	12.9 L/100 km18.2 mpg US21.9 mpg UK	11 L/100 km21.4 mpg US25.7 mpg UK
Cost / 100 km	22.58 LC100 km	19.25 LC100 km
Cost / 100 mi	36.33 LC100 mi	30.98 LC100 mi
Annual fuel used	1,935 L511 US gal426 UK gal	1,650 L436 US gal363 UK gal
Annual fuel cost	3,386 LC/year	2,888 LC/year