Car comparison

BMW 4 Series Coupe (G22) 420dvsBMW 4 Series Convertible (G23) 420d

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

New comparison

BMW 4 Series Coupe (G22)

420d

190 hp1995 ccDieselAWDAutomaticTurbochargedCoupe2020-2024
VS

BMW 4 Series Convertible (G23)

420d

190 hp1995 ccDieselRWDAutomaticTurbochargedCabriolet / convertible2020-2024

Comparison overview

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

Best choices

BMW 4 Series Coupe (G22) 420d

  • Quickest 0-100 km/h
    7.4 s
  • Fastest top speed
    238 km/h
    148 mph
  • Most powerful
    190 hp
    142 kW
  • Highest torque
    400 Nm
    295 lb-ft
  • Lightest
    1,670 kg
    3,682 lb
  • Best power-to-weight
    114 hp/t
    85 kW/t
    8.8 kg/hp
  • Lowest highway consumption
    4.2 L/100 km
    56.0 mpg US
    67.3 mpg UK
  • Largest trunk
    440 L
  • Best overall score
    53/100
  • Best performance score
    53/100
  • Best practicality score
    53/100

BMW 4 Series Convertible (G23) 420d

  • Lowest combined fuel consumption
    4.5 L/100 km
    52.3 mpg US
    62.8 mpg UK
  • Lowest city consumption
    5.0 L/100 km
    47.0 mpg US
    56.5 mpg UK
  • Best estimated range
    1,311 km
    815 mi
  • Best economy score
    95/100

Specification comparison

Specification comparison
ModelBMW4 Series Coupe (G22)420dBMW4 Series Convertible (G23)420d
Power
190hp142kW
190hp142kW
Torque
400Nm295lb-ft
400Nm295lb-ft
Curb weight
1,670kg3,682lb
1,775kg3,913lb
Gross weight
2,165kg4,773lb
2,270kg5,004lb
Top speed
238 km/h
148 mph
236 km/h
147 mph
To 99% top speed
92.0s99% target: 236 km/h / 146 mph
Calculated
99.0s99% target: 234 km/h / 145 mph
Calculated
0-100 km/h
7.4s
7.6s
0-200 km/h
31.0s
Calculated
33.5s
Calculated
0-60 mph
7.0s
Calculated
7.2s
Calculated
Fuel consumption
4.6L/100 km51.1mpg US61.4mpg UK
4.5L/100 km52.3mpg US62.8mpg UK
Fuel consumption city
5.2L/100 km45.2mpg US54.3mpg UK
5L/100 km47mpg US56.5mpg UK
Fuel consumption highway
4.2L/100 km56mpg US67.3mpg UK
4.3L/100 km54.7mpg US65.7mpg UK
Quarter mile
15.3s
Calculated
15.5s
Calculated
Power-to-weight
114hp/t85kW/t52hp/1000 lb
Calculated
107hp/t80kW/t49hp/1000 lb
Calculated
Torque-to-weight
240Nm/t160lb-ft/ton
Calculated
225Nm/t151lb-ft/ton
Calculated
Estimated range
1,283km797mi
Calculated
1,311km815mi
Calculated
Displacement
1,995cc122cu in
1,995cc122cu in
Length
4,768mm188in
4,768mm188in
Width
1,852mm73in
1,852mm73in
Height
1,390mm55in
1,384mm54in
Wheelbase
2,851mm112in
2,851mm112in
Front track
1,575mm62in
1,575mm62in
Rear track
1,611mm63in
1,611mm63in
Ground clearance
126mm5in
124mm5in
Trunk volume
440L
300L
Max trunk volume-
385L
Doors
2
2
Seats
4
4
Fuel tank
59L
59L

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 4 Series Coupe (G22) 420dBMW 4 Series Convertible (G23) 420dPowerTorque
  • BMW 4 Series Coupe (G22) 420d: Power / Torque
  • BMW 4 Series Convertible (G23) 420d: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW4 Series Coupe (G22)420d4,000 rpm1,750-2,500 rpm4,250 rpm
BMW4 Series Convertible (G23)420d4,000 rpm1,750-2,500 rpm4,250 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW4 Series Coupe (G22)420dBMW4 Series Convertible (G23)420d
Acceleration checkpoints
0-60 mph
0-97 km/h
7.0 s
7.2 s
0-100 km/h
0-62 mph
7.4 s
7.6 s
0-200 km/h
0-124 mph
31.0 s
33.5 s
Top speed
238 km/h
148 mph
236 km/h
147 mph
Drag race simulation
60 ft
18 m
2.5 s
2.5 s
330 ft
101 m
6.7 s
6.7 s
1/8 mile
201 m
10.0 s
10.1 s
1000 ft
305 m
12.9 s
13.0 s
1/4 mile
402 m
15.3 s
15.5 s
Trap speed
1/4 mile
402 m
151 km/h
94 mph
149 km/h
92 mph

Power comparison

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

Chart data table
VehicleValue
BMW4 Series Coupe (G22)420d
190 hp
142 kW
BMW4 Series Convertible (G23)420d
190 hp
142 kW

Torque comparison

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

Chart data table
VehicleValue
BMW4 Series Coupe (G22)420d
400 Nm
295 lb-ft
BMW4 Series Convertible (G23)420d
400 Nm
295 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMW4 Series Coupe (G22)420d
1,670 kg
3,682 lb
BMW4 Series Convertible (G23)420d
1,775 kg
3,913 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 Coupe (G22)420d
238 km/h
148 mph
BMW4 Series Convertible (G23)420d
236 km/h
147 mph

0-100 km/h comparison

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

Chart data table
VehicleValue
BMW4 Series Coupe (G22)420d7.4 s
BMW4 Series Convertible (G23)420d7.6 s

The biggest 0-100 km/h difference is between BMW 4 Series Coupe (G22) 420d and BMW 4 Series Convertible (G23) 420d: 0.2 s.

Fuel consumption comparison

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

Chart data table
VehicleValue
BMW4 Series Coupe (G22)420d
4.6 L/100 km
51.1 mpg US
61.4 mpg UK
BMW4 Series Convertible (G23)420d
4.5 L/100 km
52.3 mpg US
62.8 mpg UK

Power-to-weight comparison

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

Chart data table
VehicleValue
BMW4 Series Coupe (G22)420d
114 hp/t
85 kW/t
8.8 kg/hp
BMW4 Series Convertible (G23)420d
107 hp/t
80 kW/t
9.3 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMW4 Series Coupe (G22)420d
1,283 km
797 mi
BMW4 Series Convertible (G23)420d
1,311 km
815 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW4 Series Coupe (G22)420d
190 hp
142 kW
7.4 s
238 km/h
148 mph
BMW4 Series Convertible (G23)420d
190 hp
142 kW
7.6 s
236 km/h
147 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 Coupe (G22)420d
Power
190 hp
142 kW
0-100 km/h7.4 s
Top speed
238 km/h
148 mph
Doors/seats
2 doors
4 seats
Trunk
440 L
15.5 cu ft
Length
4,768 mm
187.7 in
Height
1,390 mm
54.7 in
BMW4 Series Convertible (G23)420d
Power
190 hp
142 kW
0-100 km/h7.6 s
Top speed
236 km/h
147 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

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
BMW4 Series Coupe (G22)420d
Power
190 hp
142 kW
0-100 km/h7.4 s
Top speed
238 km/h
148 mph
4.6 L/100 km
51.1 mpg US
61.4 mpg UK
BMW4 Series Convertible (G23)420d
Power
190 hp
142 kW
0-100 km/h7.6 s
Top speed
236 km/h
147 mph
4.5 L/100 km
52.3 mpg US
62.8 mpg UK

BMW 4 Series Coupe (G22) 420d 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
BMW4 Series Coupe (G22)420d
4.6 L/100 km
51.1 mpg US
61.4 mpg UK
7.4 s
BMW4 Series Convertible (G23)420d
4.5 L/100 km
52.3 mpg US
62.8 mpg UK
7.6 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
BMW4 Series Coupe (G22)420d
114 hp/t
85 kW/t
8.8 kg/hp
4.6 L/100 km
51.1 mpg US
61.4 mpg UK
BMW4 Series Convertible (G23)420d
107 hp/t
80 kW/t
9.3 kg/hp
4.5 L/100 km
52.3 mpg US
62.8 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW4 Series Coupe (G22)420dBMW4 Series Convertible (G23)420d
Power
190 hp
142 kW
190 hp
142 kW
Torque
400 Nm
295 lb-ft
400 Nm
295 lb-ft
Acceleration
7.4 s
7.6 s
Top speed
238 km/h
148 mph
236 km/h
147 mph
Lightness
1,670 kg
3,682 lb
1,775 kg
3,913 lb
Fuel consumption
4.6 L/100 km
51.1 mpg US
61.4 mpg UK
4.5 L/100 km
52.3 mpg US
62.8 mpg UK
Practicality
Doors/seats
2 doors
4 seats
Trunk
440 L
15.5 cu ft
Length
4,768 mm
187.7 in
Height
1,390 mm
54.7 in
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
Range score
1,283 km
797 mi
1,311 km
815 mi
Trunk score
440 L
15.5 cu ft
300 L
10.6 cu ft
Power-to-weight score
114 hp/t
85 kW/t
8.8 kg/hp
107 hp/t
80 kW/t
9.3 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 Coupe (G22) 420dBMW 4 Series Convertible (G23) 420d
Consumption4.6 L/100 km51.1 mpg US61.4 mpg UK4.5 L/100 km52.3 mpg US62.8 mpg UK
Cost / 100 km8.05 LC100 km7.88 LC100 km
Cost / 100 mi12.96 LC100 mi12.67 LC100 mi
Annual fuel used690 L182 US gal152 UK gal675 L178 US gal148 UK gal
Annual fuel cost1,208 LC/year1,181 LC/year

Head-to-head comparisons

BMW 4 Series Coupe (G22) 420d

  • Is 105 kg lighter
  • Is 0.2 s quicker from 0-100 km/h
  • Has 2 km/h (1 mph) higher top speed
  • Has 7 hp/t better power-to-weight
  • Has 140 L more trunk volume

Pros

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

Cons

  • Highest combined fuel consumption

BMW 4 Series Convertible (G23) 420d

  • Uses 0.1 L/100 km less fuel
  • Has 29 km (18 mi) more estimated range

Pros

  • Lowest combined fuel consumption
  • Best estimated range

Cons

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

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 4 Series Coupe (G22) 420d
BMW 4 Series Convertible (G23) 420d
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