Car comparison

BMW 6 Series Convertible (E64) 645CivsMercedes-Benz CLK (A208) · Facelift 1999 AMG CLK 55 V8

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
VS

Mercedes-Benz CLK (A208) · Facelift 1999

AMG CLK 55 V8

347 hp5439 ccGasolineRWDAutomaticNaturally aspiratedCabriolet / convertible1999-2002

Comparison overview

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

Best choices

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
  • 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
  • Best economy score
    76/100

Specification comparison

Specification comparison
ModelBMW6 Series Convertible (E64)645CiMercedes-BenzCLK (A208)Facelift 1999AMG CLK 55 V8
Power
333hp248kW
347hp259kW
Torque
450Nm332lb-ft
510Nm376lb-ft
Curb weight
1,820kg4,012lb
1,680kg3,704lb
Gross weight
2,220kg4,894lb
2,080kg4,586lb
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
88.1s99% target: 257 km/h / 160 mph
Calculated
80.2s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
6.2s
6.2s
0-200 km/h
22.8s
Calculated
21.8s
Calculated
0-60 mph
5.9s
Calculated
5.9s
Calculated
Fuel consumption
11.5L/100 km20.5mpg US24.6mpg UK
11.7L/100 km20.1mpg US24.1mpg UK
Fuel consumption city
16.8L/100 km14mpg US16.8mpg UK
17.1L/100 km13.8mpg US16.5mpg UK
Fuel consumption highway
8.5L/100 km27.7mpg US33.2mpg UK
8.5L/100 km27.7mpg US33.2mpg UK
Quarter mile
14.3s
Calculated
14.2s
Calculated
Power-to-weight
183hp/t136kW/t83hp/1000 lb
Calculated
207hp/t154kW/t94hp/1000 lb
Calculated
Torque-to-weight
247Nm/t165lb-ft/ton
Calculated
304Nm/t203lb-ft/ton
Calculated
Estimated range
609km378mi
Calculated
530km329mi
Calculated
Displacement
4,398cc268cu in
5,439cc332cu in
Length
4,820mm190in
4,567mm180in
Width
1,855mm73in
1,722mm68in
Height
1,373mm54in
1,380mm54in
Wheelbase
2,780mm109in
2,690mm106in
Front track
1,558mm61in
1,505mm59in
Rear track
1,592mm63in
1,488mm59in
Trunk volume
300L
-
Max trunk volume
350L
-
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 (A208) Facelift 1999 AMG CLK 55 V8PowerTorque
  • BMW 6 Series Convertible (E64) 645Ci: Power / Torque
  • Mercedes-Benz CLK (A208) Facelift 1999 AMG CLK 55 V8: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW6 Series Convertible (E64)645Ci6,100 rpm3,600 rpm6,350 rpm
Mercedes-BenzCLK (A208)Facelift 1999AMG CLK 55 V85,500 rpm3,000-4,300 rpm5,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW6 Series Convertible (E64)645CiMercedes-BenzCLK (A208)Facelift 1999AMG CLK 55 V8
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
21.8 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
2.3 s
2.4 s
330 ft
101 m
6.2 s
6.3 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
14.2 s
Trap speed
1/4 mile
402 m
163 km/h
101 mph
165 km/h
103 mph

Power comparison

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

Chart data table
VehicleValue
BMW6 Series Convertible (E64)645Ci
333 hp
248 kW
Mercedes-BenzCLK (A208)Facelift 1999AMG CLK 55 V8
347 hp
259 kW

Mercedes-Benz CLK (A208) Facelift 1999 AMG CLK 55 V8 has 14 hp more than BMW 6 Series Convertible (E64) 645Ci.

The biggest power difference is between BMW 6 Series Convertible (E64) 645Ci and Mercedes-Benz CLK (A208) Facelift 1999 AMG CLK 55 V8: 14 hp (10 kW).

Torque comparison

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

Chart data table
VehicleValue
BMW6 Series Convertible (E64)645Ci
450 Nm
332 lb-ft
Mercedes-BenzCLK (A208)Facelift 1999AMG CLK 55 V8
510 Nm
376 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMW6 Series Convertible (E64)645Ci
1,820 kg
4,012 lb
Mercedes-BenzCLK (A208)Facelift 1999AMG CLK 55 V8
1,680 kg
3,704 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
BMW6 Series Convertible (E64)645Ci
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Mercedes-BenzCLK (A208)Facelift 1999AMG CLK 55 V8
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
VehicleValue
BMW6 Series Convertible (E64)645Ci6.2 s
Mercedes-BenzCLK (A208)Facelift 1999AMG CLK 55 V86.2 s

Although Mercedes-Benz CLK (A208) Facelift 1999 AMG CLK 55 V8 has more power, BMW 6 Series Convertible (E64) 645Ci is quicker from 0-100 km/h.

Fuel consumption comparison

Bar comparison chart for Fuel consumption. Lower is better · L/100 km / mpg US / mpg UK

Chart data table
VehicleValue
BMW6 Series Convertible (E64)645Ci
11.5 L/100 km
20.5 mpg US
24.6 mpg UK
Mercedes-BenzCLK (A208)Facelift 1999AMG CLK 55 V8
11.7 L/100 km
20.1 mpg US
24.1 mpg UK

Power-to-weight comparison

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

Chart data table
VehicleValue
BMW6 Series Convertible (E64)645Ci
183 hp/t
136 kW/t
5.5 kg/hp
Mercedes-BenzCLK (A208)Facelift 1999AMG CLK 55 V8
207 hp/t
154 kW/t
4.8 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMW6 Series Convertible (E64)645Ci
609 km
378 mi
Mercedes-BenzCLK (A208)Facelift 1999AMG CLK 55 V8
530 km
329 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop 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 (A208)Facelift 1999AMG CLK 55 V8
347 hp
259 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.

Chart data table
VehiclePerformance scorePracticality score
BMW6 Series Convertible (E64)645Ci
Power
333 hp
248 kW
0-100 km/h6.2 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 (A208)Facelift 1999AMG CLK 55 V8
Power
347 hp
259 kW
0-100 km/h6.2 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk-
Length
4,567 mm
179.8 in
Height
1,380 mm
54.3 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
BMW6 Series Convertible (E64)645Ci
Power
333 hp
248 kW
0-100 km/h6.2 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 (A208)Facelift 1999AMG CLK 55 V8
Power
347 hp
259 kW
0-100 km/h6.2 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
11.7 L/100 km
20.1 mpg US
24.1 mpg UK

Mercedes-Benz CLK (A208) Facelift 1999 AMG CLK 55 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
BMW6 Series Convertible (E64)645Ci
11.5 L/100 km
20.5 mpg US
24.6 mpg UK
6.2 s
Mercedes-BenzCLK (A208)Facelift 1999AMG CLK 55 V8
11.7 L/100 km
20.1 mpg US
24.1 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
VehiclePower-to-weight, hp/tFuel 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 (A208)Facelift 1999AMG CLK 55 V8
207 hp/t
154 kW/t
4.8 kg/hp
11.7 L/100 km
20.1 mpg US
24.1 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW6 Series Convertible (E64)645CiMercedes-BenzCLK (A208)Facelift 1999AMG CLK 55 V8
Power
333 hp
248 kW
347 hp
259 kW
Torque
450 Nm
332 lb-ft
510 Nm
376 lb-ft
Acceleration
6.2 s
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
1,680 kg
3,704 lb
Fuel consumption
11.5 L/100 km
20.5 mpg US
24.6 mpg UK
11.7 L/100 km
20.1 mpg US
24.1 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-
Length
4,567 mm
179.8 in
Height
1,380 mm
54.3 in
Range score
609 km
378 mi
530 km
329 mi
Trunk score
300 L
10.6 cu ft
-
Power-to-weight score
183 hp/t
136 kW/t
5.5 kg/hp
207 hp/t
154 kW/t
4.8 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
VehicleBMW 6 Series Convertible (E64) 645CiMercedes-Benz CLK (A208) Facelift 1999 AMG CLK 55 V8
Consumption11.5 L/100 km20.5 mpg US24.6 mpg UK11.7 L/100 km20.1 mpg US24.1 mpg UK
Cost / 100 km20.13 LC100 km20.47 LC100 km
Cost / 100 mi32.39 LC100 mi32.95 LC100 mi
Annual fuel used1,725 L456 US gal379 UK gal1,755 L464 US gal386 UK gal
Annual fuel cost3,019 LC/year3,071 LC/year

Head-to-head comparisons

BMW 6 Series Convertible (E64) 645Ci

  • Uses 0.2 L/100 km less fuel
  • Has 79 km (49 mi) more estimated range

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Lowest combined fuel consumption
  • Best estimated range

Cons

  • Lowest power
  • Heaviest

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 6 Series Convertible (E64) 645Ci
Mercedes-Benz CLK (A208) AMG CLK 55 V8
Compare selected cars
2 vehicles selected

Popular comparisons

645Ci
650i
VS
BMW6 Series Convertible (E64)645CivsBMW6 Series Convertible (E64)Facelift 2007650i
AMG CLK 55 V8
AMG CLK 55 V8
VS
Mercedes-BenzCLK (A208)Facelift 1999AMG CLK 55 V8vsMercedes-BenzCLK (A209)AMG CLK 55 V8
645Ci
645Ci
VS
BMW6 Series Convertible (E64)645CivsBMW6 Series (E63)645Ci
AMG CLK 55 V8
AMG CLK 55 V8
VS
Mercedes-BenzCLK (A208)Facelift 1999AMG CLK 55 V8vsMercedes-BenzCLK (C208)Facelift 1999AMG CLK 55 V8
645Ci
640i
VS
BMW6 Series Convertible (E64)645CivsBMW6 Series Convertible (F12)640i
AMG CLK 55 V8
CLK 320 V6
VS
Mercedes-BenzCLK (A208)Facelift 1999AMG CLK 55 V8vsMercedes-BenzCLK (A208)CLK 320 V6
645Ci
635d
VS
BMW6 Series Convertible (E64)645CivsBMW6 Series (E63)Facelift 2007635d
AMG CLK 55 V8
CLK 430 V8
VS
Mercedes-BenzCLK (A208)Facelift 1999AMG CLK 55 V8vsMercedes-BenzCLK (C208)CLK 430 V8
645Ci
640i
VS
BMW6 Series Convertible (E64)645CivsBMW6 Series Gran Coupe (F06)640i
AMG CLK 55 V8
AMG CLK DTM 5.5 V8
VS
Mercedes-BenzCLK (A208)Facelift 1999AMG CLK 55 V8vsMercedes-BenzCLK (A209)Facelift 2005AMG CLK DTM 5.5 V8
645Ci
640i
VS
BMW6 Series Convertible (E64)645CivsBMW6 Series Coupe (F13)640i
AMG CLK 55 V8
AMG CLK 63 Black Series V8
VS
Mercedes-BenzCLK (A208)Facelift 1999AMG CLK 55 V8vsMercedes-BenzCLK (C209)Facelift 2005AMG CLK 63 Black Series V8
BMW 6 Series Convertible (E64) 645Ci vs Mercedes-Benz CLK (A208) · Facelift 1999 AMG CLK 55 V8 - car comparison - FastVsFaster