Car comparison

BMW 4 Series Convertible (G23) 420ivsBMW 4 Series Gran Coupe (F36) · Facelift 2017 418d

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

New comparison

BMW 4 Series Convertible (G23)

420i

184 hp1998 ccGasolineRWDAutomaticTurbochargedCabriolet / convertible2020-2024
VS

BMW 4 Series Gran Coupe (F36) · Facelift 2017

418d

150 hp1995 ccDieselRWDAutomaticTurbochargedCoupe2017-2021

Comparison overview

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

Best choices

BMW 4 Series Gran Coupe (F36) Facelift 2017 418d

  • Highest torque
    320 Nm
    236 lb-ft
  • Lightest
    1,530 kg
    3,373 lb
  • Lowest combined fuel consumption
    4.4 L/100 km
    53.5 mpg US
    64.2 mpg UK
  • Lowest city consumption
    5.3 L/100 km
    44.4 mpg US
    53.3 mpg UK
  • Lowest highway consumption
    3.9 L/100 km
    60.3 mpg US
    72.4 mpg UK
  • Best estimated range
    1,295 km
    805 mi
  • Largest trunk
    480 L
  • Best overall score
    51/100
  • Best economy score
    95/100
  • Best practicality score
    65/100

BMW 4 Series Convertible (G23) 420i

  • Quickest 0-100 km/h
    8.2 s
  • Fastest top speed
    236 km/h
    147 mph
  • Most powerful
    184 hp
    137 kW
  • Best power-to-weight
    109 hp/t
    81 kW/t
    9.2 kg/hp
  • Best performance score
    48/100

Specification comparison

Specification comparison
ModelBMW4 Series Convertible (G23)420iBMW4 Series Gran Coupe (F36)Facelift 2017418d
Power
184hp137kW
150hp112kW
Torque
300Nm221lb-ft
320Nm236lb-ft
Curb weight
1,690kg3,726lb
1,530kg3,373lb
Gross weight
2,185kg4,817lb
2,090kg4,608lb
Top speed
236 km/h
147 mph
213 km/h
132 mph
To 99% top speed
107.5s99% target: 234 km/h / 145 mph
Calculated
96.0s99% target: 211 km/h / 131 mph
Calculated
0-100 km/h
8.2s
8.9s
0-200 km/h
36.3s
Calculated
52.8s
Calculated
0-60 mph
7.8s
Calculated
8.4s
Calculated
Fuel consumption
6.1L/100 km38.6mpg US46.3mpg UK
4.4L/100 km53.5mpg US64.2mpg UK
Fuel consumption city
7.4L/100 km31.8mpg US38.2mpg UK
5.3L/100 km44.4mpg US53.3mpg UK
Fuel consumption highway
5.4L/100 km43.6mpg US52.3mpg UK
3.9L/100 km60.3mpg US72.4mpg UK
Quarter mile
15.9s
Calculated
16.4s
Calculated
Power-to-weight
109hp/t81kW/t49hp/1000 lb
Calculated
98hp/t73kW/t44hp/1000 lb
Calculated
Torque-to-weight
178Nm/t119lb-ft/ton
Calculated
209Nm/t140lb-ft/ton
Calculated
Estimated range
967km601mi
Calculated
1,295km805mi
Calculated
Displacement
1,998cc122cu in
1,995cc122cu in
Length
4,768mm188in
4,640mm183in
Width
1,852mm73in
1,825mm72in
Height
1,384mm54in
1,389mm55in
Wheelbase
2,851mm112in
2,810mm111in
Front track
1,575mm62in
1,557mm61in
Rear track
1,611mm63in
1,604mm63in
Ground clearance
124mm5in
130mm5in
Trunk volume
300L
480L
Max trunk volume
385L
1,300L
Doors
2
4
Seats
4
5
Fuel tank
59L
57L
CO2 emissions-
116g/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) 420iBMW 4 Series Gran Coupe (F36) Facelift 2017 418dPowerTorque
  • BMW 4 Series Convertible (G23) 420i: Power / Torque
  • BMW 4 Series Gran Coupe (F36) Facelift 2017 418d: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW4 Series Convertible (G23)420i5,000-6,500 rpm1,350-4,000 rpm6,750 rpm
BMW4 Series Gran Coupe (F36)Facelift 2017418d4,000 rpm1,500-3,000 rpm4,250 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW4 Series Convertible (G23)420iBMW4 Series Gran Coupe (F36)Facelift 2017418d
Acceleration checkpoints
0-60 mph
0-97 km/h
7.8 s
8.4 s
0-100 km/h
0-62 mph
8.2 s
8.9 s
0-200 km/h
0-124 mph
36.3 s
52.8 s
Top speed
236 km/h
147 mph
213 km/h
132 mph
Drag race simulation
60 ft
18 m
2.6 s
2.6 s
330 ft
101 m
6.9 s
7.1 s
1/8 mile
201 m
10.4 s
10.7 s
1000 ft
305 m
13.4 s
13.8 s
1/4 mile
402 m
15.9 s
16.4 s
Trap speed
1/4 mile
402 m
145 km/h
90 mph
139 km/h
86 mph

Power comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (G23)420i
184 hp
137 kW
BMW4 Series Gran Coupe (F36)Facelift 2017418d
150 hp
112 kW

BMW 4 Series Convertible (G23) 420i has 34 hp more than BMW 4 Series Gran Coupe (F36) Facelift 2017 418d.

The biggest power difference is between BMW 4 Series Gran Coupe (F36) Facelift 2017 418d and BMW 4 Series Convertible (G23) 420i: 34 hp (25 kW).

Torque comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (G23)420i
300 Nm
221 lb-ft
BMW4 Series Gran Coupe (F36)Facelift 2017418d
320 Nm
236 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (G23)420i
1,690 kg
3,726 lb
BMW4 Series Gran Coupe (F36)Facelift 2017418d
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
VehicleValue
BMW4 Series Convertible (G23)420i
236 km/h
147 mph
BMW4 Series Gran Coupe (F36)Facelift 2017418d
213 km/h
132 mph

0-100 km/h comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (G23)420i8.2 s
BMW4 Series Gran Coupe (F36)Facelift 2017418d8.9 s

The biggest 0-100 km/h difference is between BMW 4 Series Convertible (G23) 420i and BMW 4 Series Gran Coupe (F36) Facelift 2017 418d: 0.7 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 Convertible (G23)420i
6.1 L/100 km
38.6 mpg US
46.3 mpg UK
BMW4 Series Gran Coupe (F36)Facelift 2017418d
4.4 L/100 km
53.5 mpg US
64.2 mpg UK

The biggest fuel consumption difference is between BMW 4 Series Gran Coupe (F36) Facelift 2017 418d and BMW 4 Series Convertible (G23) 420i: 1.7 L/100 km.

Power-to-weight comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (G23)420i
109 hp/t
81 kW/t
9.2 kg/hp
BMW4 Series Gran Coupe (F36)Facelift 2017418d
98 hp/t
73 kW/t
10.2 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (G23)420i
967 km
601 mi
BMW4 Series Gran Coupe (F36)Facelift 2017418d
1,295 km
805 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW4 Series Convertible (G23)420i
184 hp
137 kW
8.2 s
236 km/h
147 mph
BMW4 Series Gran Coupe (F36)Facelift 2017418d
150 hp
112 kW
8.9 s
213 km/h
132 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 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
BMW4 Series Gran Coupe (F36)Facelift 2017418d
Power
150 hp
112 kW
0-100 km/h8.9 s
Top speed
213 km/h
132 mph
Doors/seats
4 doors
5 seats
Trunk
480 L
17.0 cu ft
Length
4,640 mm
182.7 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.

Performance vs fuel economy data table
VehiclePerformance scoreFuel economy score
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
BMW4 Series Gran Coupe (F36)Facelift 2017418d
Power
150 hp
112 kW
0-100 km/h8.9 s
Top speed
213 km/h
132 mph
4.4 L/100 km
53.5 mpg US
64.2 mpg UK

BMW 4 Series Convertible (G23) 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 Convertible (G23)420i
6.1 L/100 km
38.6 mpg US
46.3 mpg UK
8.2 s
BMW4 Series Gran Coupe (F36)Facelift 2017418d
4.4 L/100 km
53.5 mpg US
64.2 mpg UK
8.9 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 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
BMW4 Series Gran Coupe (F36)Facelift 2017418d
98 hp/t
73 kW/t
10.2 kg/hp
4.4 L/100 km
53.5 mpg US
64.2 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW4 Series Convertible (G23)420iBMW4 Series Gran Coupe (F36)Facelift 2017418d
Power
184 hp
137 kW
150 hp
112 kW
Torque
300 Nm
221 lb-ft
320 Nm
236 lb-ft
Acceleration
8.2 s
8.9 s
Top speed
236 km/h
147 mph
213 km/h
132 mph
Lightness
1,690 kg
3,726 lb
1,530 kg
3,373 lb
Fuel consumption
6.1 L/100 km
38.6 mpg US
46.3 mpg UK
4.4 L/100 km
53.5 mpg US
64.2 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
4 doors
5 seats
Trunk
480 L
17.0 cu ft
Length
4,640 mm
182.7 in
Height
1,389 mm
54.7 in
Range score
967 km
601 mi
1,295 km
805 mi
CO2 score
-
116 g/km
Trunk score
300 L
10.6 cu ft
480 L
17.0 cu ft
Power-to-weight score
109 hp/t
81 kW/t
9.2 kg/hp
98 hp/t
73 kW/t
10.2 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 Convertible (G23) 420iBMW 4 Series Gran Coupe (F36) Facelift 2017 418d
Consumption6.1 L/100 km38.6 mpg US46.3 mpg UK4.4 L/100 km53.5 mpg US64.2 mpg UK
Cost / 100 km10.67 LC100 km7.70 LC100 km
Cost / 100 mi17.18 LC100 mi12.39 LC100 mi
Annual fuel used915 L242 US gal201 UK gal660 L174 US gal145 UK gal
Annual fuel cost1,601 LC/year1,155 LC/year

Head-to-head comparisons

BMW 4 Series Convertible (G23) 420i

  • Has 34 hp more
  • Is 0.7 s quicker from 0-100 km/h
  • Has 23 km/h (14 mph) higher top speed
  • Has 11 hp/t better power-to-weight

Pros

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

Cons

  • Highest combined fuel consumption
  • Heaviest
  • Smallest trunk

BMW 4 Series Gran Coupe (F36) Facelift 2017 418d

  • Has 20 Nm more
  • Is 160 kg lighter
  • Uses 1.7 L/100 km less fuel
  • Has 328 km (204 mi) more estimated range
  • Has 180 L more trunk volume

Pros

  • Highest torque
  • Lightest
  • Lowest combined fuel consumption
  • Best estimated range
  • Largest trunk

Cons

  • Slowest 0-100 km/h
  • Lowest power
  • Lowest top speed

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 4 Series Convertible (G23) 420i
BMW 4 Series Gran Coupe (F36) 418d
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BMW 4 Series Convertible (G23) 420i vs BMW 4 Series Gran Coupe (F36) · Facelift 2017 418d - car comparison - FastVsFaster