Car comparison

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

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

New comparison

BMW 4 Series Convertible (G23)

420d

190 hp1995 ccDieselRWDAutomaticTurbochargedCabriolet / convertible2020-2024

BMW 4 Series Coupe (F32)

420i

184 hp1997 ccGasolineAWDAutomaticTurbochargedCoupe2013-2016

Comparison overview

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

BMW 4 Series Convertible (G23) 420d

Fastest top speed
236 km/h
147 mph
Most powerful
190 hp
142 kW
Highest torque
400 Nm
295 lb-ft
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
Lowest highway consumption
4.3 L/100 km
54.7 mpg US
65.7 mpg UK
Best estimated range
1,311 km
815 mi
Best overall score
50/100
Best performance score
52/100
Best economy score
95/100

BMW 4 Series Coupe (F32) 420i

Quickest 0-100 km/h
7.5 s
Lightest
1,530 kg
3,373 lb
Best power-to-weight
120 hp/t
90 kW/t
8.3 kg/hp
Largest trunk
445 L
Best practicality score
53/100

Specification comparison

Specification comparison
Model	BMW4 Series Convertible (G23)420d	BMW4 Series Coupe (F32)420i
Power	190hp142kW	184hp137kW
Torque	400Nm295lb-ft	270Nm199lb-ft
Curb weight	1,775kg3,913lb	1,530kg3,373lb
Gross weight	2,270kg5,004lb	2,050kg4,519lb
Top speed	236 km/h 147 mph	231 km/h 144 mph
To 99% top speed	99.3s99% target: 234 km/h / 145 mph Calculated	93.5s99% target: 229 km/h / 142 mph Calculated
0-100 km/h	7.6s	7.5s
0-200 km/h	33.6s Calculated	34.4s Calculated
0-60 mph	7.2s Calculated	7.1s Calculated
Fuel consumption	4.5L/100 km52.3mpg US62.8mpg UK	6.5L/100 km36.2mpg US43.5mpg UK
Fuel consumption city	5L/100 km47mpg US56.5mpg UK	8.8L/100 km26.7mpg US32.1mpg UK
Fuel consumption highway	4.3L/100 km54.7mpg US65.7mpg UK	5.2L/100 km45.2mpg US54.3mpg UK
Quarter mile	15.5s Calculated	15.4s Calculated
Power-to-weight	107hp/t80kW/t49hp/1000 lb Calculated	120hp/t90kW/t55hp/1000 lb Calculated
Torque-to-weight	225Nm/t151lb-ft/ton Calculated	176Nm/t118lb-ft/ton Calculated
Estimated range	1,311km815mi Calculated	923km574mi Calculated
Displacement	1,995cc122cu in	1,997cc122cu in
Length	4,768mm188in	4,638mm183in
Width	1,852mm73in	1,825mm72in
Height	1,384mm54in	1,392mm55in
Wheelbase	2,851mm112in	2,810mm111in
Front track	1,575mm62in	1,545mm61in
Rear track	1,611mm63in	1,594mm63in
Ground clearance	124mm5in	145mm6in
Trunk volume	300L	445L
Max trunk volume	385L	-
Doors	2	2
Seats	4	4
Fuel tank	59L	60L
CO2 emissions	-	152g/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 Convertible (G23) 420dBMW 4 Series Coupe (F32) 420iPowerTorque

Dyno simulation data table
Vehicle	Peak power RPM	Peak torque RPM	Max engine speed
BMW4 Series Convertible (G23)420d	4,000 rpm	1,750-2,500 rpm	4,250 rpm
BMW4 Series Coupe (F32)420i	5,000-6,250 rpm	1,250-4,500 rpm	6,500 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
Metric	BMW4 Series Convertible (G23)420d	BMW4 Series Coupe (F32)420i
	Acceleration checkpoints
0-60 mph 0-97 km/h	7.2 s	7.1 s
0-100 km/h 0-62 mph	7.6 s	7.5 s
0-200 km/h 0-124 mph	33.6 s	34.4 s
Top speed	236 km/h 147 mph	231 km/h 144 mph
	Drag race simulation
60 ft 18 m	2.5 s	2.5 s
330 ft 101 m	6.7 s	6.6 s
1/8 mile 201 m	10.1 s	10.0 s
1000 ft 305 m	13.0 s	13.0 s
1/4 mile 402 m	15.5 s	15.4 s
Trap speed 1/4 mile 402 m	148 km/h 92 mph	149 km/h 92 mph

Power comparison

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

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

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

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

Torque comparison

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

Chart data table
Vehicle	Value
BMW4 Series Convertible (G23)420d	400 Nm 295 lb-ft
BMW4 Series Coupe (F32)420i	270 Nm 199 lb-ft

Curb weight comparison

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

Chart data table
Vehicle	Value
BMW4 Series Convertible (G23)420d	1,775 kg 3,913 lb
BMW4 Series Coupe (F32)420i	1,530 kg 3,373 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
BMW4 Series Convertible (G23)420d	236 km/h 147 mph
BMW4 Series Coupe (F32)420i	231 km/h 144 mph

0-100 km/h comparison

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

Chart data table
Vehicle	Value
BMW4 Series Convertible (G23)420d	7.6 s
BMW4 Series Coupe (F32)420i	7.5 s

Although BMW 4 Series Convertible (G23) 420d has more power, BMW 4 Series Coupe (F32) 420i is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between BMW 4 Series Coupe (F32) 420i and BMW 4 Series Convertible (G23) 420d: 0.1 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
BMW4 Series Convertible (G23)420d	4.5 L/100 km 52.3 mpg US 62.8 mpg UK
BMW4 Series Coupe (F32)420i	6.5 L/100 km 36.2 mpg US 43.5 mpg UK

The biggest fuel consumption difference is between BMW 4 Series Convertible (G23) 420d and BMW 4 Series Coupe (F32) 420i: 2.0 L/100 km.

Power-to-weight comparison

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

Chart data table
Vehicle	Value
BMW4 Series Convertible (G23)420d	107 hp/t 80 kW/t 9.3 kg/hp
BMW4 Series Coupe (F32)420i	120 hp/t 90 kW/t 8.3 kg/hp

Estimated range comparison

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

Chart data table
Vehicle	Value
BMW4 Series Convertible (G23)420d	1,311 km 815 mi
BMW4 Series Coupe (F32)420i	923 km 574 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
Vehicle	Power	Acceleration	Top speed
BMW4 Series Convertible (G23)420d	190 hp 142 kW	7.6 s	236 km/h 147 mph
BMW4 Series Coupe (F32)420i	184 hp 137 kW	7.5 s	231 km/h 144 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

BMW4 Series Convertible (G23)420d

Power	190 hp 142 kW
0-100 km/h	7.6 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

BMW4 Series Coupe (F32)420i

Power	184 hp 137 kW
0-100 km/h	7.5 s
Top speed 231 km/h 144 mph

Doors/seats	2 doors 4 seats
Trunk	445 L 15.7 cu ft
Length	4,638 mm 182.6 in
Height	1,392 mm 54.8 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

BMW4 Series Convertible (G23)420d

Power	190 hp 142 kW
0-100 km/h	7.6 s
Top speed 236 km/h 147 mph

4.5 L/100 km

52.3 mpg US

62.8 mpg UK

BMW4 Series Coupe (F32)420i

Power	184 hp 137 kW
0-100 km/h	7.5 s
Top speed 231 km/h 144 mph

6.5 L/100 km

36.2 mpg US

43.5 mpg UK

BMW 4 Series Convertible (G23) 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
Vehicle	Fuel consumption, L/100 km	0-100 km/h, s
BMW4 Series Convertible (G23)420d	4.5 L/100 km 52.3 mpg US 62.8 mpg UK	7.6 s
BMW4 Series Coupe (F32)420i	6.5 L/100 km 36.2 mpg US 43.5 mpg UK	7.5 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
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
BMW4 Series Coupe (F32)420i	120 hp/t 90 kW/t 8.3 kg/hp	6.5 L/100 km 36.2 mpg US 43.5 mpg UK

Detailed score breakdown

Vehicle

BMW4 Series Convertible (G23)420d

BMW4 Series Coupe (F32)420i

Power

190 hp

142 kW

184 hp

137 kW

Torque

400 Nm

295 lb-ft

270 Nm

199 lb-ft

Acceleration

7.6 s

7.5 s

Top speed

236 km/h

147 mph

231 km/h

144 mph

Lightness

1,775 kg

3,913 lb

1,530 kg

3,373 lb

Fuel consumption

4.5 L/100 km

52.3 mpg US

62.8 mpg UK

6.5 L/100 km

36.2 mpg US

43.5 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	2 doors 4 seats
Trunk	445 L 15.7 cu ft
Length	4,638 mm 182.6 in
Height	1,392 mm 54.8 in

Range score

1,311 km

815 mi

923 km

574 mi

CO2 score

152 g/km

Trunk score

300 L

10.6 cu ft

445 L

15.7 cu ft

Power-to-weight score

107 hp/t

80 kW/t

9.3 kg/hp

120 hp/t

90 kW/t

8.3 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 4 Series Convertible (G23) 420d	BMW 4 Series Coupe (F32) 420i
Consumption	4.5 L/100 km52.3 mpg US62.8 mpg UK	6.5 L/100 km36.2 mpg US43.5 mpg UK
Cost / 100 km	7.88 LC100 km	11.38 LC100 km
Cost / 100 mi	12.67 LC100 mi	18.31 LC100 mi
Annual fuel used	675 L178 US gal148 UK gal	975 L258 US gal214 UK gal
Annual fuel cost	1,181 LC/year	1,706 LC/year