Car comparison

BMW 6 Series Convertible (E64) 645CivsMercedes-Benz CLK (A209) CLK 500

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

New comparison

BMW 6 Series Convertible (E64)

645Ci

333 hp4398 ccGasolineRWDAutomaticNaturally aspiratedCabriolet / convertible2003-2005

Mercedes-Benz CLK (A209)

CLK 500

306 hp4966 ccGasolineRWDAutomaticNaturally aspiratedCabriolet / convertible2003-2004

Comparison overview

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

BMW 6 Series Convertible (E64) 645Ci

Quickest 0-100 km/h
6.2 s
Fastest top speed
260 km/h
162 mph Unrestricted
250 km/h
155 mph Restricted
Most powerful
333 hp
248 kW
Best power-to-weight
183 hp/t
136 kW/t
5.5 kg/hp
Lowest combined fuel consumption
11.5 L/100 km
20.5 mpg US
24.6 mpg UK
Lowest city consumption
16.8 L/100 km
14.0 mpg US
16.8 mpg UK
Lowest highway consumption
8.5 L/100 km
27.7 mpg US
33.2 mpg UK
Best estimated range
609 km
378 mi
Largest trunk
300 L
Best overall score
59/100
Best performance score
65/100
Best economy score
76/100
Best practicality score
45/100

Mercedes-Benz CLK (A209) CLK 500

Highest torque
460 Nm
339 lb-ft
Lightest
1,710 kg
3,770 lb

Specification comparison

Specification comparison
Model	BMW6 Series Convertible (E64)645Ci	Mercedes-BenzCLK (A209)CLK 500
Power	333hp248kW	306hp228kW
Torque	450Nm332lb-ft	460Nm339lb-ft
Curb weight	1,820kg4,012lb	1,710kg3,770lb
Gross weight	2,220kg4,894lb	2,225kg4,905lb
Top speed	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Calculated	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Calculated
To 99% top speed	87.8s99% target: 257 km/h / 160 mph Calculated	85.0s99% target: 257 km/h / 160 mph Calculated
0-100 km/h	6.2s	6.2s
0-200 km/h	22.8s Calculated	22.4s Calculated
0-60 mph	5.9s Calculated	5.9s Calculated
Fuel consumption	11.5L/100 km20.5mpg US24.6mpg UK	11.6L/100 km20.3mpg US24.4mpg UK
Fuel consumption city	16.8L/100 km14mpg US16.8mpg UK	17.2L/100 km13.7mpg US16.4mpg UK
Fuel consumption highway	8.5L/100 km27.7mpg US33.2mpg UK	8.6L/100 km27.4mpg US32.8mpg UK
Quarter mile	14.3s Calculated	14.3s Calculated
Power-to-weight	183hp/t136kW/t83hp/1000 lb Calculated	179hp/t133kW/t81hp/1000 lb Calculated
Torque-to-weight	247Nm/t165lb-ft/ton Calculated	269Nm/t180lb-ft/ton Calculated
Estimated range	609km378mi Calculated	534km332mi Calculated
Displacement	4,398cc268cu in	4,966cc303cu in
Length	4,820mm190in	4,638mm183in
Width	1,855mm73in	1,740mm69in
Height	1,373mm54in	1,413mm56in
Wheelbase	2,780mm109in	2,715mm107in
Front track	1,558mm61in	1,497mm59in
Rear track	1,592mm63in	1,478mm58in
Trunk volume	300L	276L
Max trunk volume	350L	390L
Doors	2	2
Seats	4	4
Fuel tank	70L	62L

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) 645CiMercedes-Benz CLK (A209) CLK 500PowerTorque

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
Mercedes-BenzCLK (A209)CLK 500	5,600 rpm	2,700-4,250 rpm	6,000 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
Metric	BMW6 Series Convertible (E64)645Ci	Mercedes-BenzCLK (A209)CLK 500
	Acceleration checkpoints
0-60 mph 0-97 km/h	5.9 s	5.9 s
0-100 km/h 0-62 mph	6.2 s	6.2 s
0-200 km/h 0-124 mph	22.8 s	22.4 s
Top speed	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Likely limited	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Limited
	Drag race simulation
60 ft 18 m	2.4 s	2.4 s
330 ft 101 m	6.2 s	6.2 s
1/8 mile 201 m	9.3 s	9.4 s
1000 ft 305 m	12.0 s	12.0 s
1/4 mile 402 m	14.3 s	14.3 s
Trap speed 1/4 mile 402 m	163 km/h 101 mph	164 km/h 102 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
Mercedes-BenzCLK (A209)CLK 500	306 hp 228 kW

BMW 6 Series Convertible (E64) 645Ci has 27 hp more than Mercedes-Benz CLK (A209) CLK 500.

The biggest power difference is between Mercedes-Benz CLK (A209) CLK 500 and BMW 6 Series Convertible (E64) 645Ci: 27 hp (20 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
Mercedes-BenzCLK (A209)CLK 500	460 Nm 339 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	1,820 kg 4,012 lb
Mercedes-BenzCLK (A209)CLK 500	1,710 kg 3,770 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
Mercedes-BenzCLK (A209)CLK 500	Unrestricted 260 km/h162 mph Restricted 250 km/h155 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	6.2 s
Mercedes-BenzCLK (A209)CLK 500	6.2 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	11.5 L/100 km 20.5 mpg US 24.6 mpg UK
Mercedes-BenzCLK (A209)CLK 500	11.6 L/100 km 20.3 mpg US 24.4 mpg UK

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 136 kW/t 5.5 kg/hp
Mercedes-BenzCLK (A209)CLK 500	179 hp/t 133 kW/t 5.6 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	609 km 378 mi
Mercedes-BenzCLK (A209)CLK 500	534 km 332 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	6.2 s	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph
Mercedes-BenzCLK (A209)CLK 500	306 hp 228 kW	6.2 s	Unrestricted 260 km/h162 mph Restricted 250 km/h155 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	6.2 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

Mercedes-BenzCLK (A209)CLK 500

Power	306 hp 228 kW
0-100 km/h	6.2 s
Top speed Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph

Doors/seats	2 doors 4 seats
Trunk	276 L 9.7 cu ft
Length	4,638 mm 182.6 in
Height	1,413 mm 55.6 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	6.2 s
Top speed Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph

11.5 L/100 km

20.5 mpg US

24.6 mpg UK

Mercedes-BenzCLK (A209)CLK 500

Power	306 hp 228 kW
0-100 km/h	6.2 s
Top speed Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph

11.6 L/100 km

20.3 mpg US

24.4 mpg UK

BMW 6 Series Convertible (E64) 645Ci 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	11.5 L/100 km 20.5 mpg US 24.6 mpg UK	6.2 s
Mercedes-BenzCLK (A209)CLK 500	11.6 L/100 km 20.3 mpg US 24.4 mpg UK	6.2 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)645Ci	183 hp/t 136 kW/t 5.5 kg/hp	11.5 L/100 km 20.5 mpg US 24.6 mpg UK
Mercedes-BenzCLK (A209)CLK 500	179 hp/t 133 kW/t 5.6 kg/hp	11.6 L/100 km 20.3 mpg US 24.4 mpg UK

Detailed score breakdown

Vehicle

BMW6 Series Convertible (E64)645Ci

Mercedes-BenzCLK (A209)CLK 500

Power

333 hp

248 kW

306 hp

228 kW

Torque

450 Nm

332 lb-ft

460 Nm

339 lb-ft

Acceleration

6.2 s

Top speed

Unrestricted

260 km/h162 mph

Restricted

250 km/h155 mph

Unrestricted

260 km/h162 mph

Restricted

250 km/h155 mph

Lightness

1,820 kg

4,012 lb

1,710 kg

3,770 lb

Fuel consumption

11.5 L/100 km

20.5 mpg US

24.6 mpg UK

11.6 L/100 km

20.3 mpg US

24.4 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 4 seats
Trunk	276 L 9.7 cu ft
Length	4,638 mm 182.6 in
Height	1,413 mm 55.6 in

Range score

609 km

378 mi

534 km

332 mi

Trunk score

300 L

10.6 cu ft

276 L

9.7 cu ft

Power-to-weight score

183 hp/t

136 kW/t

5.5 kg/hp

179 hp/t

133 kW/t

5.6 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	Mercedes-Benz CLK (A209) CLK 500
Consumption	11.5 L/100 km20.5 mpg US24.6 mpg UK	11.6 L/100 km20.3 mpg US24.4 mpg UK
Cost / 100 km	20.13 LC100 km	20.30 LC100 km
Cost / 100 mi	32.39 LC100 mi	32.67 LC100 mi
Annual fuel used	1,725 L456 US gal379 UK gal	1,740 L460 US gal383 UK gal
Annual fuel cost	3,019 LC/year	3,045 LC/year