Car comparison

BMW 4 Series Convertible (G23) M440dvsBMW iX (I20) 76.6 kWh

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

New comparison

BMW 4 Series Convertible (G23)

M440d

340 hp2993 ccDieselAWDAutomaticTurbochargedCabriolet / convertible2021-2024
VS

BMW iX (I20)

76.6 kWh

326 hpElectricAWDAutomatic2021-2025

Comparison overview

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

Best choices

BMW 4 Series Convertible (G23) M440d

  • Quickest 0-100 km/h
    5.0 s
  • Fastest top speed
    260 km/h
    162 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Most powerful
    340 hp
    254 kW
  • Highest torque
    700 Nm
    516 lb-ft
  • Lightest
    1,980 kg
    4,365 lb
  • Best power-to-weight
    172 hp/t
    128 kW/t
    5.8 kg/hp
  • Best performance score
    74/100
  • Best economy score
    89/100

Specification comparison

Specification comparison
ModelBMW4 Series Convertible (G23)M440dBMWiX (I20)76.6 kWh
Power
340hp254kW
326hp243kW
Torque
700Nm516lb-ft
630Nm465lb-ft
Curb weight
1,980kg4,365lb
2,365kg5,214lb
Gross weight
2,480kg5,467lb
3,010kg6,636lb
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
Unrestricted
210 km/h130 mph
Restricted
200 km/h124 mph
Calculated
To 99% top speed
70.1s99% target: 257 km/h / 160 mph
Calculated
67.9s99% target: 208 km/h / 129 mph
Calculated
0-100 km/h
5.0s
6.1s
0-200 km/h
18.3s
Calculated
40.9s
Calculated
0-60 mph
4.7s
Calculated
5.8s
Calculated
Fuel consumption
6.6L/100 km35.6mpg US42.8mpg UK
-
Quarter mile
13.2s
Calculated
14.4s
Calculated
Power-to-weight
172hp/t128kW/t78hp/1000 lb
Calculated
138hp/t103kW/t63hp/1000 lb
Calculated
Torque-to-weight
354Nm/t237lb-ft/ton
Calculated
266Nm/t178lb-ft/ton
Calculated
Estimated range
894km555mi
Calculated
-
Displacement
2,993cc183cu in
-
Length
4,768mm188in
4,953mm195in
Width
1,852mm73in
1,967mm77in
Height
1,384mm54in
1,695mm67in
Wheelbase
2,851mm112in
3,000mm118in
Front track
1,573mm62in
1,679mm66in
Rear track
1,612mm63in
1,709mm67in
Ground clearance-
202mm8in
Trunk volume
300L
500L
Max trunk volume
385L
1,750L
Doors
2
5
Seats
4
5
Fuel tank
59L
-

Performance charts

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

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW4 Series Convertible (G23)M440dBMWiX (I20)76.6 kWh
Acceleration checkpoints
0-60 mph
0-97 km/h
4.7 s
5.8 s
0-100 km/h
0-62 mph
5.0 s
6.1 s
0-200 km/h
0-124 mph
18.3 s
40.9 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Limited
Unrestricted
210 km/h130 mph
Restricted
200 km/h124 mph
Limited
Drag race simulation
60 ft
18 m
2.1 s
2.2 s
330 ft
101 m
5.7 s
6.0 s
1/8 mile
201 m
8.6 s
9.2 s
1000 ft
305 m
11.1 s
12.0 s
1/4 mile
402 m
13.2 s
14.4 s
Trap speed
1/4 mile
402 m
174 km/h
108 mph
153 km/h
95 mph

Power comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (G23)M440d
340 hp
254 kW
BMWiX (I20)76.6 kWh
326 hp
243 kW

BMW 4 Series Convertible (G23) M440d has 14 hp more than BMW iX (I20) 76.6 kWh.

The biggest power difference is between BMW iX (I20) 76.6 kWh and BMW 4 Series Convertible (G23) M440d: 14 hp (10 kW).

Torque comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (G23)M440d
700 Nm
516 lb-ft
BMWiX (I20)76.6 kWh
630 Nm
465 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (G23)M440d
1,980 kg
4,365 lb
BMWiX (I20)76.6 kWh
2,365 kg
5,214 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (G23)M440d
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMWiX (I20)76.6 kWh
Unrestricted
210 km/h130 mph
Restricted
200 km/h124 mph

0-100 km/h comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (G23)M440d5.0 s
BMWiX (I20)76.6 kWh6.1 s

The biggest 0-100 km/h difference is between BMW 4 Series Convertible (G23) M440d and BMW iX (I20) 76.6 kWh: 1.1 s.

Power-to-weight comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (G23)M440d
172 hp/t
128 kW/t
5.8 kg/hp
BMWiX (I20)76.6 kWh
138 hp/t
103 kW/t
7.3 kg/hp

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW4 Series Convertible (G23)M440d
340 hp
254 kW
5.0 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMWiX (I20)76.6 kWh
326 hp
243 kW
6.1 s
Unrestricted
210 km/h130 mph
Restricted
200 km/h124 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
BMW4 Series Convertible (G23)M440d
Power
340 hp
254 kW
0-100 km/h5.0 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
4,768 mm
187.7 in
Height
1,384 mm
54.5 in
BMWiX (I20)76.6 kWh
Power
326 hp
243 kW
0-100 km/h6.1 s
Top speed
Unrestricted
210 km/h130 mph
Restricted
200 km/h124 mph
Doors/seats
5 doors
5 seats
Trunk
500 L
17.7 cu ft
Length
4,953 mm
195.0 in
Height
1,695 mm
66.7 in

Detailed score breakdown

Detailed score breakdown
VehicleBMW4 Series Convertible (G23)M440dBMWiX (I20)76.6 kWh
Power
340 hp
254 kW
326 hp
243 kW
Torque
700 Nm
516 lb-ft
630 Nm
465 lb-ft
Acceleration
5.0 s
6.1 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Unrestricted
210 km/h130 mph
Restricted
200 km/h124 mph
Lightness
1,980 kg
4,365 lb
2,365 kg
5,214 lb
Fuel consumption
6.6 L/100 km
35.6 mpg US
42.8 mpg UK
-
Practicality
Doors/seats
2 doors
4 seats
Trunk
300 L
10.6 cu ft
Length
4,768 mm
187.7 in
Height
1,384 mm
54.5 in
Doors/seats
5 doors
5 seats
Trunk
500 L
17.7 cu ft
Length
4,953 mm
195.0 in
Height
1,695 mm
66.7 in
Range score
894 km
555 mi
-
Trunk score
300 L
10.6 cu ft
500 L
17.7 cu ft
Power-to-weight score
172 hp/t
128 kW/t
5.8 kg/hp
138 hp/t
103 kW/t
7.3 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 4 Series Convertible (G23) M440d
Consumption6.6 L/100 km35.6 mpg US42.8 mpg UK
Cost / 100 km11.55 LC100 km
Cost / 100 mi18.59 LC100 mi
Annual fuel used990 L262 US gal218 UK gal
Annual fuel cost1,733 LC/year

Head-to-head comparisons

BMW 4 Series Convertible (G23) M440d

  • Has 14 hp more
  • Has 70 Nm more
  • Is 385 kg lighter
  • Is 1.1 s quicker from 0-100 km/h
  • Has 50 km/h (31 mph) higher top speed
  • Has 34 hp/t better power-to-weight

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Most powerful
  • Highest torque
  • Lightest
  • Best power-to-weight ratio

Cons

  • Smallest trunk

BMW iX (I20) 76.6 kWh

  • Has 200 L more trunk volume

Pros

  • Largest trunk

Cons

  • Slowest 0-100 km/h
  • Lowest power
  • Heaviest
  • Lowest top speed

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 4 Series Convertible (G23) M440d
BMW iX (I20) 76.6 kWh
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BMW 4 Series Convertible (G23) M440d vs BMW iX (I20) 76.6 kWh - car comparison - FastVsFaster