Car comparison

BMW 4 Series Convertible (G23) 420dvsBMW 4 Series Gran Coupe (F36) 420d

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 Gran Coupe (F36)

420d

184 hp1995 ccDieselRWDAutomaticTurbochargedCoupe2014-2015

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
Best estimated range
1,311 km
815 mi
Best performance score
52/100
Best economy score
95/100

BMW 4 Series Gran Coupe (F36) 420d

Quickest 0-100 km/h
7.5 s
Lightest
1,525 kg
3,362 lb
Best power-to-weight
121 hp/t
90 kW/t
8.3 kg/hp
Lowest highway consumption
4.1 L/100 km
57.4 mpg US
68.9 mpg UK
Largest trunk
480 L
Best overall score
57/100
Best practicality score
68/100

Specification comparison

Specification comparison
Model	BMW4 Series Convertible (G23)420d	BMW4 Series Gran Coupe (F36)420d
Power	190hp142kW	184hp137kW
Torque	400Nm295lb-ft	380Nm280lb-ft
Curb weight	1,775kg3,913lb	1,525kg3,362lb
Gross weight	2,270kg5,004lb	2,085kg4,597lb
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	90.7s99% target: 229 km/h / 142 mph Calculated
0-100 km/h	7.6s	7.5s
0-200 km/h	33.6s Calculated	33.8s Calculated
0-60 mph	7.2s Calculated	7.1s Calculated
Fuel consumption	4.5L/100 km52.3mpg US62.8mpg UK	4.6L/100 km51.1mpg US61.4mpg UK
Fuel consumption city	5L/100 km47mpg US56.5mpg UK	5.4L/100 km43.6mpg US52.3mpg UK
Fuel consumption highway	4.3L/100 km54.7mpg US65.7mpg UK	4.1L/100 km57.4mpg US68.9mpg UK
Quarter mile	15.5s Calculated	15.4s Calculated
Power-to-weight	107hp/t80kW/t49hp/1000 lb Calculated	121hp/t90kW/t55hp/1000 lb Calculated
Torque-to-weight	225Nm/t151lb-ft/ton Calculated	249Nm/t167lb-ft/ton Calculated
Estimated range	1,311km815mi Calculated	1,239km770mi Calculated
Displacement	1,995cc122cu in	1,995cc122cu in
Length	4,768mm188in	4,638mm183in
Width	1,852mm73in	1,825mm72in
Height	1,384mm54in	1,389mm55in
Wheelbase	2,851mm112in	2,810mm111in
Front track	1,575mm62in	1,545mm61in
Rear track	1,611mm63in	1,594mm63in
Ground clearance	124mm5in	130mm5in
Trunk volume	300L	480L
Max trunk volume	385L	1,300L
Doors	2	5
Seats	4	5
Fuel tank	59L	57L
CO2 emissions	-	121g/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 Gran Coupe (F36) 420dPowerTorque

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 Gran Coupe (F36)420d	4,000 rpm	1,750-2,750 rpm	4,250 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
Metric	BMW4 Series Convertible (G23)420d	BMW4 Series Gran Coupe (F36)420d
	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	33.8 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	6.7 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 93 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 Gran Coupe (F36)420d	184 hp 137 kW

BMW 4 Series Convertible (G23) 420d has 6 hp more than BMW 4 Series Gran Coupe (F36) 420d.

The biggest power difference is between BMW 4 Series Gran Coupe (F36) 420d 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 Gran Coupe (F36)420d	380 Nm 280 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 Gran Coupe (F36)420d	1,525 kg 3,362 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 Gran Coupe (F36)420d	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 Gran Coupe (F36)420d	7.5 s

Although BMW 4 Series Convertible (G23) 420d has more power, BMW 4 Series Gran Coupe (F36) 420d is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between BMW 4 Series Gran Coupe (F36) 420d 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 Gran Coupe (F36)420d	4.6 L/100 km 51.1 mpg US 61.4 mpg UK

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 Gran Coupe (F36)420d	121 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 Gran Coupe (F36)420d	1,239 km 770 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 Gran Coupe (F36)420d	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 Gran Coupe (F36)420d

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

Doors/seats	5 doors 5 seats
Trunk	480 L 17.0 cu ft
Length	4,638 mm 182.6 in
Height	1,389 mm 54.7 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 Gran Coupe (F36)420d

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

4.6 L/100 km

51.1 mpg US

61.4 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 Gran Coupe (F36)420d	4.6 L/100 km 51.1 mpg US 61.4 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 Gran Coupe (F36)420d	121 hp/t 90 kW/t 8.3 kg/hp	4.6 L/100 km 51.1 mpg US 61.4 mpg UK

Detailed score breakdown

Vehicle

BMW4 Series Convertible (G23)420d

BMW4 Series Gran Coupe (F36)420d

Power

190 hp

142 kW

184 hp

137 kW

Torque

400 Nm

295 lb-ft

380 Nm

280 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

1,525 kg

3,362 lb

Fuel consumption

4.5 L/100 km

52.3 mpg US

62.8 mpg UK

4.6 L/100 km

51.1 mpg US

61.4 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	480 L 17.0 cu ft
Length	4,638 mm 182.6 in
Height	1,389 mm 54.7 in

Range score

1,311 km

815 mi

1,239 km

770 mi

CO2 score

121 g/km

Trunk score

300 L

10.6 cu ft

480 L

17.0 cu ft

Power-to-weight score

107 hp/t

80 kW/t

9.3 kg/hp

121 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 Gran Coupe (F36) 420d
Consumption	4.5 L/100 km52.3 mpg US62.8 mpg UK	4.6 L/100 km51.1 mpg US61.4 mpg UK
Cost / 100 km	7.88 LC100 km	8.05 LC100 km
Cost / 100 mi	12.67 LC100 mi	12.96 LC100 mi
Annual fuel used	675 L178 US gal148 UK gal	690 L182 US gal152 UK gal
Annual fuel cost	1,181 LC/year	1,208 LC/year