Car comparison

BMW 4 Series Convertible (G23) 420dvsBMW 4 Series Gran Coupe (G26) 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 (G26)

420d

190 hp1995 ccDieselAWDAutomaticTurbochargedCoupe2021-2024

Comparison overview

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

BMW 4 Series Convertible (G23) 420d

Quickest 0-100 km/h
7.6 s
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
Best estimated range
1,311 km
815 mi
Best performance score
52/100
Best economy score
95/100

BMW 4 Series Gran Coupe (G26) 420d

Lightest
1,760 kg
3,880 lb
Best power-to-weight
108 hp/t
81 kW/t
9.3 kg/hp
Largest trunk
470 L
Best overall score
57/100
Best practicality score
69/100

Specification comparison

Specification comparison
Model	BMW4 Series Convertible (G23)420d	BMW4 Series Gran Coupe (G26)420d
Power	190hp142kW	190hp142kW
Torque	400Nm295lb-ft	400Nm295lb-ft
Curb weight	1,775kg3,913lb	1,760kg3,880lb
Gross weight	2,270kg5,004lb	2,315kg5,104lb
Top speed	236 km/h 147 mph	233 km/h 145 mph
To 99% top speed	99.3s99% target: 234 km/h / 145 mph Calculated	96.3s99% target: 231 km/h / 143 mph Calculated
0-100 km/h	7.6s	7.6s
0-200 km/h	33.6s Calculated	34.3s Calculated
0-60 mph	7.2s Calculated	7.2s Calculated
Fuel consumption	4.5L/100 km52.3mpg US62.8mpg UK	5.7L/100 km41.3mpg US49.6mpg UK
Fuel consumption city	5L/100 km47mpg US56.5mpg UK	-
Fuel consumption highway	4.3L/100 km54.7mpg US65.7mpg UK	-
Quarter mile	15.5s Calculated	15.5s Calculated
Power-to-weight	107hp/t80kW/t49hp/1000 lb Calculated	108hp/t81kW/t49hp/1000 lb Calculated
Torque-to-weight	225Nm/t151lb-ft/ton Calculated	227Nm/t152lb-ft/ton Calculated
Estimated range	1,311km815mi Calculated	1,035km643mi Calculated
Displacement	1,995cc122cu in	1,995cc122cu in
Length	4,768mm188in	4,783mm188in
Width	1,852mm73in	1,852mm73in
Height	1,384mm54in	1,442mm57in
Wheelbase	2,851mm112in	2,856mm112in
Front track	1,575mm62in	1,597mm63in
Rear track	1,611mm63in	1,624mm64in
Ground clearance	124mm5in	140mm6in
Trunk volume	300L	470L
Max trunk volume	385L	1,290L
Doors	2	5
Seats	4	5
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 Convertible (G23) 420dBMW 4 Series Gran Coupe (G26) 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 (G26)420d	4,000 rpm	1,750-2,500 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 (G26)420d
	Acceleration checkpoints
0-60 mph 0-97 km/h	7.2 s	7.2 s
0-100 km/h 0-62 mph	7.6 s	7.6 s
0-200 km/h 0-124 mph	33.6 s	34.3 s
Top speed	236 km/h 147 mph	233 km/h 145 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	10.1 s
1000 ft 305 m	13.0 s	13.0 s
1/4 mile 402 m	15.5 s	15.5 s
Trap speed 1/4 mile 402 m	148 km/h 92 mph	148 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 Gran Coupe (G26)420d	190 hp 142 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 (G26)420d	400 Nm 295 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 (G26)420d	1,760 kg 3,880 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 (G26)420d	233 km/h 145 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 (G26)420d	7.6 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 (G26)420d	5.7 L/100 km 41.3 mpg US 49.6 mpg UK

The biggest fuel consumption difference is between BMW 4 Series Convertible (G23) 420d and BMW 4 Series Gran Coupe (G26) 420d: 1.2 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 Gran Coupe (G26)420d	108 hp/t 81 kW/t 9.3 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 (G26)420d	1,035 km 643 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 (G26)420d	190 hp 142 kW	7.6 s	233 km/h 145 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 (G26)420d

Power	190 hp 142 kW
0-100 km/h	7.6 s
Top speed 233 km/h 145 mph

Doors/seats	5 doors 5 seats
Trunk	470 L 16.6 cu ft
Length	4,783 mm 188.3 in
Height	1,442 mm 56.8 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 Gran Coupe (G26)420d

Power	190 hp 142 kW
0-100 km/h	7.6 s
Top speed 233 km/h 145 mph

5.7 L/100 km

41.3 mpg US

49.6 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 (G26)420d	5.7 L/100 km 41.3 mpg US 49.6 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
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 (G26)420d	108 hp/t 81 kW/t 9.3 kg/hp	5.7 L/100 km 41.3 mpg US 49.6 mpg UK

Detailed score breakdown

Vehicle

BMW4 Series Convertible (G23)420d

BMW4 Series Gran Coupe (G26)420d

Power

190 hp

142 kW

190 hp

142 kW

Torque

400 Nm

295 lb-ft

400 Nm

295 lb-ft

Acceleration

7.6 s

Top speed

236 km/h

147 mph

233 km/h

145 mph

Lightness

1,775 kg

3,913 lb

1,760 kg

3,880 lb

Fuel consumption

4.5 L/100 km

52.3 mpg US

62.8 mpg UK

5.7 L/100 km

41.3 mpg US

49.6 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	470 L 16.6 cu ft
Length	4,783 mm 188.3 in
Height	1,442 mm 56.8 in

Range score

1,311 km

815 mi

1,035 km

643 mi

Trunk score

300 L

10.6 cu ft

470 L

16.6 cu ft

Power-to-weight score

107 hp/t

80 kW/t

9.3 kg/hp

108 hp/t

81 kW/t

9.3 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 (G26) 420d
Consumption	4.5 L/100 km52.3 mpg US62.8 mpg UK	5.7 L/100 km41.3 mpg US49.6 mpg UK
Cost / 100 km	7.88 LC100 km	9.98 LC100 km
Cost / 100 mi	12.67 LC100 mi	16.05 LC100 mi
Annual fuel used	675 L178 US gal148 UK gal	855 L226 US gal188 UK gal
Annual fuel cost	1,181 LC/year	1,496 LC/year