Car comparison

BMW 4 Series Gran Coupe (F36) 420ivsBMW 4 Series Convertible (G23) 420i

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

New comparison

BMW 4 Series Gran Coupe (F36)

420i

184 hp1997 ccGasolineRWDAutomaticTurbochargedCoupe2014-2016
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 Gran Coupe (F36) 420i

  • Quickest 0-100 km/h
    7.6 s
  • Fastest top speed
    236 km/h
    147 mph
  • Most powerful
    184 hp
    137 kW
  • Lightest
    1,580 kg
    3,483 lb
  • Best power-to-weight
    116 hp/t
    87 kW/t
    8.6 kg/hp
  • Lowest highway consumption
    5.0 L/100 km
    47.0 mpg US
    56.5 mpg UK
  • Best overall score
    56/100
  • Best performance score
    49/100
  • Best economy score
    90/100
  • Best practicality score
    70/100

BMW 4 Series Convertible (G23) 420i

  • Highest torque
    300 Nm
    221 lb-ft
  • Lowest combined fuel consumption
    6.1 L/100 km
    38.6 mpg US
    46.3 mpg UK
  • Lowest city consumption
    7.4 L/100 km
    31.8 mpg US
    38.2 mpg UK
  • Best estimated range
    967 km
    601 mi

Specification comparison

Specification comparison
ModelBMW4 Series Gran Coupe (F36)420iBMW4 Series Convertible (G23)420i
Power
184hp137kW
184hp137kW
Torque
270Nm199lb-ft
300Nm221lb-ft
Curb weight
1,580kg3,483lb
1,690kg3,726lb
Gross weight
2,065kg4,553lb
2,185kg4,817lb
Top speed
236 km/h
147 mph
236 km/h
147 mph
To 99% top speed
97.7s99% target: 234 km/h / 145 mph
Calculated
107.5s99% target: 234 km/h / 145 mph
Calculated
0-100 km/h
7.6s
8.2s
0-200 km/h
33.3s
Calculated
36.3s
Calculated
0-60 mph
7.2s
Calculated
7.8s
Calculated
Fuel consumption
6.3L/100 km37.3mpg US44.8mpg UK
6.1L/100 km38.6mpg US46.3mpg UK
Fuel consumption city
8.4L/100 km28mpg US33.6mpg UK
7.4L/100 km31.8mpg US38.2mpg UK
Fuel consumption highway
5L/100 km47mpg US56.5mpg UK
5.4L/100 km43.6mpg US52.3mpg UK
Quarter mile
15.5s
Calculated
15.9s
Calculated
Power-to-weight
116hp/t87kW/t53hp/1000 lb
Calculated
109hp/t81kW/t49hp/1000 lb
Calculated
Torque-to-weight
171Nm/t114lb-ft/ton
Calculated
178Nm/t119lb-ft/ton
Calculated
Estimated range
952km592mi
Calculated
967km601mi
Calculated
Displacement
1,997cc122cu in
1,998cc122cu in
Length
4,638mm183in
4,768mm188in
Width
1,825mm72in
1,852mm73in
Height
1,389mm55in
1,384mm54in
Wheelbase
2,810mm111in
2,851mm112in
Front track
1,557mm61in
1,575mm62in
Rear track
1,605mm63in
1,611mm63in
Ground clearance-
124mm5in
Trunk volume-
300L
Max trunk volume-
385L
Doors
5
2
Seats
5
4
Fuel tank
60L
59L
CO2 emissions
146g/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 (F36) 420iBMW 4 Series Convertible (G23) 420iPowerTorque
  • BMW 4 Series Gran Coupe (F36) 420i: Power / Torque
  • BMW 4 Series Convertible (G23) 420i: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW4 Series Gran Coupe (F36)420i5,000-6,250 rpm1,250-4,500 rpm6,500 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 Gran Coupe (F36)420iBMW4 Series Convertible (G23)420i
Acceleration checkpoints
0-60 mph
0-97 km/h
7.2 s
7.8 s
0-100 km/h
0-62 mph
7.6 s
8.2 s
0-200 km/h
0-124 mph
33.3 s
36.3 s
Top speed
236 km/h
147 mph
236 km/h
147 mph
Drag race simulation
60 ft
18 m
2.5 s
2.6 s
330 ft
101 m
6.7 s
6.9 s
1/8 mile
201 m
10.1 s
10.4 s
1000 ft
305 m
13.0 s
13.4 s
1/4 mile
402 m
15.5 s
15.9 s
Trap speed
1/4 mile
402 m
149 km/h
92 mph
145 km/h
90 mph

Power comparison

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

Chart data table
VehicleValue
BMW4 Series Gran Coupe (F36)420i
184 hp
137 kW
BMW4 Series Convertible (G23)420i
184 hp
137 kW

Torque comparison

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

Chart data table
VehicleValue
BMW4 Series Gran Coupe (F36)420i
270 Nm
199 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 Gran Coupe (F36)420i
1,580 kg
3,483 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 Gran Coupe (F36)420i
236 km/h
147 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 Gran Coupe (F36)420i7.6 s
BMW4 Series Convertible (G23)420i8.2 s

The biggest 0-100 km/h difference is between BMW 4 Series Gran Coupe (F36) 420i and BMW 4 Series Convertible (G23) 420i: 0.6 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 Gran Coupe (F36)420i
6.3 L/100 km
37.3 mpg US
44.8 mpg UK
BMW4 Series Convertible (G23)420i
6.1 L/100 km
38.6 mpg US
46.3 mpg UK

Power-to-weight comparison

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

Chart data table
VehicleValue
BMW4 Series Gran Coupe (F36)420i
116 hp/t
87 kW/t
8.6 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 Gran Coupe (F36)420i
952 km
592 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 Gran Coupe (F36)420i
184 hp
137 kW
7.6 s
236 km/h
147 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 Gran Coupe (F36)420i
Power
184 hp
137 kW
0-100 km/h7.6 s
Top speed
236 km/h
147 mph
Doors/seats
5 doors
5 seats
Trunk-
Length
4,638 mm
182.6 in
Height
1,389 mm
54.7 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 Gran Coupe (F36)420i
Power
184 hp
137 kW
0-100 km/h7.6 s
Top speed
236 km/h
147 mph
6.3 L/100 km
37.3 mpg US
44.8 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 Gran Coupe (F36) 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
VehicleFuel consumption, L/100 km0-100 km/h, s
BMW4 Series Gran Coupe (F36)420i
6.3 L/100 km
37.3 mpg US
44.8 mpg UK
7.6 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 Gran Coupe (F36)420i
116 hp/t
87 kW/t
8.6 kg/hp
6.3 L/100 km
37.3 mpg US
44.8 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 Gran Coupe (F36)420iBMW4 Series Convertible (G23)420i
Power
184 hp
137 kW
184 hp
137 kW
Torque
270 Nm
199 lb-ft
300 Nm
221 lb-ft
Acceleration
7.6 s
8.2 s
Top speed
236 km/h
147 mph
236 km/h
147 mph
Lightness
1,580 kg
3,483 lb
1,690 kg
3,726 lb
Fuel consumption
6.3 L/100 km
37.3 mpg US
44.8 mpg UK
6.1 L/100 km
38.6 mpg US
46.3 mpg UK
Practicality
Doors/seats
5 doors
5 seats
Trunk-
Length
4,638 mm
182.6 in
Height
1,389 mm
54.7 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
952 km
592 mi
967 km
601 mi
CO2 score
146 g/km
-
Trunk score
-
300 L
10.6 cu ft
Power-to-weight score
116 hp/t
87 kW/t
8.6 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 Gran Coupe (F36) 420iBMW 4 Series Convertible (G23) 420i
Consumption6.3 L/100 km37.3 mpg US44.8 mpg UK6.1 L/100 km38.6 mpg US46.3 mpg UK
Cost / 100 km11.03 LC100 km10.67 LC100 km
Cost / 100 mi17.74 LC100 mi17.18 LC100 mi
Annual fuel used945 L250 US gal208 UK gal915 L242 US gal201 UK gal
Annual fuel cost1,654 LC/year1,601 LC/year

Head-to-head comparisons

BMW 4 Series Gran Coupe (F36) 420i

  • Is 110 kg lighter
  • Is 0.6 s quicker from 0-100 km/h
  • Has 8 hp/t better power-to-weight

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Most powerful
  • Lightest
  • Best power-to-weight ratio

Cons

  • Highest combined fuel consumption

BMW 4 Series Convertible (G23) 420i

  • Has 30 Nm more
  • Uses 0.2 L/100 km less fuel
  • Has 15 km (9 mi) more estimated range

Pros

  • Highest torque
  • Lowest combined fuel consumption
  • Best estimated range

Cons

  • Slowest 0-100 km/h
  • Heaviest

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 4 Series Gran Coupe (F36) 420i
BMW 4 Series Convertible (G23) 420i
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