Car comparison

BMW 4 Series Coupe (F32) 420dvsBMW 4 Series Convertible (G23) 420i

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

New comparison

BMW 4 Series Coupe (F32)

420d

190 hp1995 ccDieselRWDManualTurbochargedCoupe2015-2016
VS

BMW 4 Series Convertible (G23)

420i

184 hp1998 ccGasolineRWDAutomaticTurbochargedCabriolet / convertible2020-2024

Comparison overview

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

Best choices

BMW 4 Series Coupe (F32) 420d

  • Quickest 0-100 km/h
    7.3 s
  • Fastest top speed
    240 km/h
    149 mph
  • Most powerful
    190 hp
    142 kW
  • Highest torque
    400 Nm
    295 lb-ft
  • Lightest
    1,475 kg
    3,252 lb
  • Best power-to-weight
    129 hp/t
    96 kW/t
    7.8 kg/hp
  • Lowest combined fuel consumption
    4.5 L/100 km
    52.3 mpg US
    62.8 mpg UK
  • Lowest city consumption
    5.5 L/100 km
    42.8 mpg US
    51.4 mpg UK
  • Lowest highway consumption
    3.9 L/100 km
    60.3 mpg US
    72.4 mpg UK
  • Best estimated range
    1,267 km
    787 mi
  • Largest trunk
    445 L
  • Best overall score
    54/100
  • Best performance score
    54/100
  • Best economy score
    95/100
  • Best practicality score
    53/100

Specification comparison

Specification comparison
ModelBMW4 Series Coupe (F32)420dBMW4 Series Convertible (G23)420i
Power
190hp142kW
184hp137kW
Torque
400Nm295lb-ft
300Nm221lb-ft
Curb weight
1,475kg3,252lb
1,690kg3,726lb
Gross weight
1,995kg4,398lb
2,185kg4,817lb
Top speed
240 km/h
149 mph
236 km/h
147 mph
To 99% top speed
92.0s99% target: 238 km/h / 148 mph
Calculated
107.5s99% target: 234 km/h / 145 mph
Calculated
0-100 km/h
7.3s
8.2s
0-200 km/h
30.2s
Calculated
36.3s
Calculated
0-60 mph
6.9s
Calculated
7.8s
Calculated
Fuel consumption
4.5L/100 km52.3mpg US62.8mpg UK
6.1L/100 km38.6mpg US46.3mpg UK
Fuel consumption city
5.5L/100 km42.8mpg US51.4mpg UK
7.4L/100 km31.8mpg US38.2mpg UK
Fuel consumption highway
3.9L/100 km60.3mpg US72.4mpg UK
5.4L/100 km43.6mpg US52.3mpg UK
Quarter mile
15.2s
Calculated
15.9s
Calculated
Power-to-weight
129hp/t96kW/t58hp/1000 lb
Calculated
109hp/t81kW/t49hp/1000 lb
Calculated
Torque-to-weight
271Nm/t181lb-ft/ton
Calculated
178Nm/t119lb-ft/ton
Calculated
Estimated range
1,267km787mi
Calculated
967km601mi
Calculated
Displacement
1,995cc122cu in
1,998cc122cu in
Length
4,638mm183in
4,768mm188in
Width
1,825mm72in
1,852mm73in
Height
1,377mm54in
1,384mm54in
Wheelbase
2,810mm111in
2,851mm112in
Front track
1,545mm61in
1,575mm62in
Rear track
1,594mm63in
1,611mm63in
Ground clearance
130mm5in
124mm5in
Trunk volume
445L
300L
Max trunk volume-
385L
Doors
2
2
Seats
4
4
Fuel tank
57L
59L
CO2 emissions
119g/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 4 Series Coupe (F32) 420dBMW 4 Series Convertible (G23) 420iPowerTorque
  • BMW 4 Series Coupe (F32) 420d: Power / Torque
  • BMW 4 Series Convertible (G23) 420i: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW4 Series Coupe (F32)420d4,000 rpm1,750-2,500 rpm4,250 rpm
BMW4 Series Convertible (G23)420i5,000-6,500 rpm1,350-4,000 rpm6,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW4 Series Coupe (F32)420dBMW4 Series Convertible (G23)420i
Acceleration checkpoints
0-60 mph
0-97 km/h
6.9 s
7.8 s
0-100 km/h
0-62 mph
7.3 s
8.2 s
0-200 km/h
0-124 mph
30.2 s
36.3 s
Top speed
240 km/h
149 mph
236 km/h
147 mph
Drag race simulation
60 ft
18 m
2.5 s
2.6 s
330 ft
101 m
6.6 s
6.9 s
1/8 mile
201 m
10.0 s
10.4 s
1000 ft
305 m
12.8 s
13.4 s
1/4 mile
402 m
15.2 s
15.9 s
Trap speed
1/4 mile
402 m
152 km/h
95 mph
145 km/h
90 mph

Power comparison

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

Chart data table
VehicleValue
BMW4 Series Coupe (F32)420d
190 hp
142 kW
BMW4 Series Convertible (G23)420i
184 hp
137 kW

BMW 4 Series Coupe (F32) 420d has 6 hp more than BMW 4 Series Convertible (G23) 420i.

The biggest power difference is between BMW 4 Series Convertible (G23) 420i and BMW 4 Series Coupe (F32) 420d: 6 hp (4 kW).

Torque comparison

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

Chart data table
VehicleValue
BMW4 Series Coupe (F32)420d
400 Nm
295 lb-ft
BMW4 Series Convertible (G23)420i
300 Nm
221 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMW4 Series Coupe (F32)420d
1,475 kg
3,252 lb
BMW4 Series Convertible (G23)420i
1,690 kg
3,726 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 (F32)420d
240 km/h
149 mph
BMW4 Series Convertible (G23)420i
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 (F32)420d7.3 s
BMW4 Series Convertible (G23)420i8.2 s

The biggest 0-100 km/h difference is between BMW 4 Series Coupe (F32) 420d and BMW 4 Series Convertible (G23) 420i: 0.9 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 (F32)420d
4.5 L/100 km
52.3 mpg US
62.8 mpg UK
BMW4 Series Convertible (G23)420i
6.1 L/100 km
38.6 mpg US
46.3 mpg UK

The biggest fuel consumption difference is between BMW 4 Series Coupe (F32) 420d and BMW 4 Series Convertible (G23) 420i: 1.6 L/100 km.

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 (F32)420d
129 hp/t
96 kW/t
7.8 kg/hp
BMW4 Series Convertible (G23)420i
109 hp/t
81 kW/t
9.2 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMW4 Series Coupe (F32)420d
1,267 km
787 mi
BMW4 Series Convertible (G23)420i
967 km
601 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW4 Series Coupe (F32)420d
190 hp
142 kW
7.3 s
240 km/h
149 mph
BMW4 Series Convertible (G23)420i
184 hp
137 kW
8.2 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 (F32)420d
Power
190 hp
142 kW
0-100 km/h7.3 s
Top speed
240 km/h
149 mph
Doors/seats
2 doors
4 seats
Trunk
445 L
15.7 cu ft
Length
4,638 mm
182.6 in
Height
1,377 mm
54.2 in
BMW4 Series Convertible (G23)420i
Power
184 hp
137 kW
0-100 km/h8.2 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 (F32)420d
Power
190 hp
142 kW
0-100 km/h7.3 s
Top speed
240 km/h
149 mph
4.5 L/100 km
52.3 mpg US
62.8 mpg UK
BMW4 Series Convertible (G23)420i
Power
184 hp
137 kW
0-100 km/h8.2 s
Top speed
236 km/h
147 mph
6.1 L/100 km
38.6 mpg US
46.3 mpg UK

BMW 4 Series Coupe (F32) 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 (F32)420d
4.5 L/100 km
52.3 mpg US
62.8 mpg UK
7.3 s
BMW4 Series Convertible (G23)420i
6.1 L/100 km
38.6 mpg US
46.3 mpg UK
8.2 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
BMW4 Series Coupe (F32)420d
129 hp/t
96 kW/t
7.8 kg/hp
4.5 L/100 km
52.3 mpg US
62.8 mpg UK
BMW4 Series Convertible (G23)420i
109 hp/t
81 kW/t
9.2 kg/hp
6.1 L/100 km
38.6 mpg US
46.3 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW4 Series Coupe (F32)420dBMW4 Series Convertible (G23)420i
Power
190 hp
142 kW
184 hp
137 kW
Torque
400 Nm
295 lb-ft
300 Nm
221 lb-ft
Acceleration
7.3 s
8.2 s
Top speed
240 km/h
149 mph
236 km/h
147 mph
Lightness
1,475 kg
3,252 lb
1,690 kg
3,726 lb
Fuel consumption
4.5 L/100 km
52.3 mpg US
62.8 mpg UK
6.1 L/100 km
38.6 mpg US
46.3 mpg UK
Practicality
Doors/seats
2 doors
4 seats
Trunk
445 L
15.7 cu ft
Length
4,638 mm
182.6 in
Height
1,377 mm
54.2 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
1,267 km
787 mi
967 km
601 mi
CO2 score
119 g/km
-
Trunk score
445 L
15.7 cu ft
300 L
10.6 cu ft
Power-to-weight score
129 hp/t
96 kW/t
7.8 kg/hp
109 hp/t
81 kW/t
9.2 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 (F32) 420dBMW 4 Series Convertible (G23) 420i
Consumption4.5 L/100 km52.3 mpg US62.8 mpg UK6.1 L/100 km38.6 mpg US46.3 mpg UK
Cost / 100 km7.88 LC100 km10.67 LC100 km
Cost / 100 mi12.67 LC100 mi17.18 LC100 mi
Annual fuel used675 L178 US gal148 UK gal915 L242 US gal201 UK gal
Annual fuel cost1,181 LC/year1,601 LC/year

Head-to-head comparisons

BMW 4 Series Coupe (F32) 420d

  • Has 6 hp more
  • Has 100 Nm more
  • Is 215 kg lighter
  • Is 0.9 s quicker from 0-100 km/h
  • Has 4 km/h (2 mph) higher top speed
  • Uses 1.6 L/100 km less fuel
  • Has 20 hp/t better power-to-weight
  • Has 299 km (186 mi) more estimated range
  • Has 145 L more trunk volume

Pros

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

BMW 4 Series Convertible (G23) 420i

No measurable advantages in the available data.

Cons

  • Slowest 0-100 km/h
  • Lowest power
  • Highest combined fuel consumption
  • Heaviest
  • Lowest top speed
  • Smallest trunk

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 4 Series Coupe (F32) 420d
BMW 4 Series Convertible (G23) 420i
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