Car comparison

BMW 4 Series Gran Coupe (G26) 420ivsBMW 4 Series Convertible (F33) 420i

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

New comparison

BMW 4 Series Gran Coupe (G26)

420i

184 hp1998 ccGasolineRWDAutomaticTurbochargedCoupe2021-2024

BMW 4 Series Convertible (F33)

420i

184 hp1998 ccGasolineRWDAutomaticTurbochargedCabriolet / convertible2016-2016

Comparison overview

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

BMW 4 Series Gran Coupe (G26) 420i

Quickest 0-100 km/h
7.9 s
Fastest top speed
235 km/h
146 mph
Most powerful
184 hp
137 kW
Highest torque
300 Nm
221 lb-ft
Lightest
1,620 kg
3,571 lb
Best power-to-weight
114 hp/t
85 kW/t
8.8 kg/hp
Largest trunk
470 L
Best overall score
55/100
Best performance score
49/100
Best practicality score
69/100

BMW 4 Series Convertible (F33) 420i

Lowest combined fuel consumption
6.2 L/100 km
37.9 mpg US
45.6 mpg UK
Best estimated range
968 km
601 mi
Best economy score
90/100

Specification comparison

Specification comparison
Model	BMW4 Series Gran Coupe (G26)420i	BMW4 Series Convertible (F33)420i
Power	184hp137kW	184hp137kW
Torque	300Nm221lb-ft	270Nm199lb-ft
Curb weight	1,620kg3,571lb	1,715kg3,781lb
Gross weight	2,175kg4,795lb	2,185kg4,817lb
Top speed	235 km/h 146 mph	230 km/h 143 mph
To 99% top speed	99.3s99% target: 233 km/h / 145 mph Calculated	108.6s99% target: 228 km/h / 141 mph Calculated
0-100 km/h	7.9s	8.4s
0-200 km/h	34.6s Calculated	40.0s Calculated
0-60 mph	7.5s Calculated	7.9s Calculated
Fuel consumption	7.3L/100 km32.2mpg US38.7mpg UK	6.2L/100 km37.9mpg US45.6mpg UK
Fuel consumption city	-	8.1L/100 km29mpg US34.9mpg UK
Fuel consumption highway	-	5.1L/100 km46.1mpg US55.4mpg UK
Quarter mile	15.7s Calculated	16.1s Calculated
Power-to-weight	114hp/t85kW/t52hp/1000 lb Calculated	107hp/t80kW/t49hp/1000 lb Calculated
Torque-to-weight	185Nm/t124lb-ft/ton Calculated	157Nm/t105lb-ft/ton Calculated
Estimated range	808km502mi Calculated	968km601mi Calculated
Displacement	1,998cc122cu in	1,998cc122cu in
Length	4,783mm188in	4,638mm183in
Width	1,852mm73in	1,825mm72in
Height	1,442mm57in	1,384mm54in
Wheelbase	2,856mm112in	2,810mm111in
Front track	1,595mm63in	1,545mm61in
Rear track	1,623mm64in	1,594mm63in
Ground clearance	140mm6in	130mm5in
Trunk volume	470L	370L
Max trunk volume	1,290L	-
Doors	5	2
Seats	5	4
Fuel tank	59L	60L
CO2 emissions	-	144g/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 Gran Coupe (G26) 420iBMW 4 Series Convertible (F33) 420iPowerTorque

Dyno simulation data table
Vehicle	Peak power RPM	Peak torque RPM	Max engine speed
BMW4 Series Gran Coupe (G26)420i	5,000-6,500 rpm	1,350-4,000 rpm	6,750 rpm
BMW4 Series Convertible (F33)420i	5,000 rpm	1,350-4,600 rpm	5,250 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
Metric	BMW4 Series Gran Coupe (G26)420i	BMW4 Series Convertible (F33)420i
	Acceleration checkpoints
0-60 mph 0-97 km/h	7.5 s	7.9 s
0-100 km/h 0-62 mph	7.9 s	8.4 s
0-200 km/h 0-124 mph	34.6 s	40.0 s
Top speed	235 km/h 146 mph	230 km/h 143 mph
	Drag race simulation
60 ft 18 m	2.6 s	2.6 s
330 ft 101 m	6.8 s	6.9 s
1/8 mile 201 m	10.3 s	10.5 s
1000 ft 305 m	13.2 s	13.5 s
1/4 mile 402 m	15.7 s	16.1 s
Trap speed 1/4 mile 402 m	147 km/h 91 mph	143 km/h 89 mph

Power comparison

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

Chart data table
Vehicle	Value
BMW4 Series Gran Coupe (G26)420i	184 hp 137 kW
BMW4 Series Convertible (F33)420i	184 hp 137 kW

Torque comparison

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

Chart data table
Vehicle	Value
BMW4 Series Gran Coupe (G26)420i	300 Nm 221 lb-ft
BMW4 Series Convertible (F33)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 Gran Coupe (G26)420i	1,620 kg 3,571 lb
BMW4 Series Convertible (F33)420i	1,715 kg 3,781 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 Gran Coupe (G26)420i	235 km/h 146 mph
BMW4 Series Convertible (F33)420i	230 km/h 143 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 Gran Coupe (G26)420i	7.9 s
BMW4 Series Convertible (F33)420i	8.4 s

The biggest 0-100 km/h difference is between BMW 4 Series Gran Coupe (G26) 420i and BMW 4 Series Convertible (F33) 420i: 0.5 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 Gran Coupe (G26)420i	7.3 L/100 km 32.2 mpg US 38.7 mpg UK
BMW4 Series Convertible (F33)420i	6.2 L/100 km 37.9 mpg US 45.6 mpg UK

The biggest fuel consumption difference is between BMW 4 Series Convertible (F33) 420i and BMW 4 Series Gran Coupe (G26) 420i: 1.1 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 Gran Coupe (G26)420i	114 hp/t 85 kW/t 8.8 kg/hp
BMW4 Series Convertible (F33)420i	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
Vehicle	Value
BMW4 Series Gran Coupe (G26)420i	808 km 502 mi
BMW4 Series Convertible (F33)420i	968 km 601 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
Vehicle	Power	Acceleration	Top speed
BMW4 Series Gran Coupe (G26)420i	184 hp 137 kW	7.9 s	235 km/h 146 mph
BMW4 Series Convertible (F33)420i	184 hp 137 kW	8.4 s	230 km/h 143 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 Gran Coupe (G26)420i

Power	184 hp 137 kW
0-100 km/h	7.9 s
Top speed 235 km/h 146 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

BMW4 Series Convertible (F33)420i

Power	184 hp 137 kW
0-100 km/h	8.4 s
Top speed 230 km/h 143 mph

Doors/seats	2 doors 4 seats
Trunk	370 L 13.1 cu ft
Length	4,638 mm 182.6 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.

Vehicle

Performance score

Fuel economy score

BMW4 Series Gran Coupe (G26)420i

Power	184 hp 137 kW
0-100 km/h	7.9 s
Top speed 235 km/h 146 mph

7.3 L/100 km

32.2 mpg US

38.7 mpg UK

BMW4 Series Convertible (F33)420i

Power	184 hp 137 kW
0-100 km/h	8.4 s
Top speed 230 km/h 143 mph

6.2 L/100 km

37.9 mpg US

45.6 mpg UK

BMW 4 Series Gran Coupe (G26) 420i 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 Gran Coupe (G26)420i	7.3 L/100 km 32.2 mpg US 38.7 mpg UK	7.9 s
BMW4 Series Convertible (F33)420i	6.2 L/100 km 37.9 mpg US 45.6 mpg UK	8.4 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 Gran Coupe (G26)420i	114 hp/t 85 kW/t 8.8 kg/hp	7.3 L/100 km 32.2 mpg US 38.7 mpg UK
BMW4 Series Convertible (F33)420i	107 hp/t 80 kW/t 9.3 kg/hp	6.2 L/100 km 37.9 mpg US 45.6 mpg UK

Detailed score breakdown

Vehicle

BMW4 Series Gran Coupe (G26)420i

BMW4 Series Convertible (F33)420i

Power

184 hp

137 kW

184 hp

137 kW

Torque

300 Nm

221 lb-ft

270 Nm

199 lb-ft

Acceleration

7.9 s

8.4 s

Top speed

235 km/h

146 mph

230 km/h

143 mph

Lightness

1,620 kg

3,571 lb

1,715 kg

3,781 lb

Fuel consumption

7.3 L/100 km

32.2 mpg US

38.7 mpg UK

6.2 L/100 km

37.9 mpg US

45.6 mpg UK

Practicality

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

Doors/seats	2 doors 4 seats
Trunk	370 L 13.1 cu ft
Length	4,638 mm 182.6 in
Height	1,384 mm 54.5 in

Range score

808 km

502 mi

968 km

601 mi

CO2 score

144 g/km

Trunk score

470 L

16.6 cu ft

370 L

13.1 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

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 Gran Coupe (G26) 420i	BMW 4 Series Convertible (F33) 420i
Consumption	7.3 L/100 km32.2 mpg US38.7 mpg UK	6.2 L/100 km37.9 mpg US45.6 mpg UK
Cost / 100 km	12.78 LC100 km	10.85 LC100 km
Cost / 100 mi	20.56 LC100 mi	17.46 LC100 mi
Annual fuel used	1,095 L289 US gal241 UK gal	930 L246 US gal205 UK gal
Annual fuel cost	1,916 LC/year	1,628 LC/year