Car comparison

BMW 4 Series Convertible (F33) 425dvsBMW 1 Series Convertible (E88) 125i

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

New comparison

BMW 4 Series Convertible (F33)

425d

218 hp1995 ccDieselRWDManualTurbochargedCabriolet / convertible2014-2016
VS

BMW 1 Series Convertible (E88)

125i

218 hp2996 ccGasolineRWDManualNaturally aspiratedCabriolet / convertible2008-2011

Comparison overview

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

Best choices

BMW 4 Series Convertible (F33) 425d

  • Fastest top speed
    241 km/h
    150 mph
  • Most powerful
    218 hp
    163 kW
  • Highest torque
    450 Nm
    332 lb-ft
  • Lowest combined fuel consumption
    5.4 L/100 km
    43.6 mpg US
    52.3 mpg UK
  • Lowest city consumption
    6.6 L/100 km
    35.6 mpg US
    42.8 mpg UK
  • Lowest highway consumption
    4.7 L/100 km
    50.0 mpg US
    60.1 mpg UK
  • Lowest CO2 emissions
    142 g/km
  • Best estimated range
    1,056 km
    656 mi
  • Largest trunk
    370 L
  • Best overall score
    52/100
  • Best performance score
    55/100
  • Best economy score
    92/100
  • Best practicality score
    47/100

Specification comparison

Specification comparison
ModelBMW4 Series Convertible (F33)425dBMW1 Series Convertible (E88)125i
Power
218hp163kW
218hp163kW
Torque
450Nm332lb-ft
270Nm199lb-ft
Curb weight
1,715kg3,781lb
1,510kg3,329lb
Gross weight
2,165kg4,773lb
1,950kg4,299lb
Top speed
241 km/h
150 mph
238 km/h
148 mph
To 99% top speed
98.2s99% target: 239 km/h / 148 mph
Calculated
88.3s99% target: 236 km/h / 146 mph
Calculated
0-100 km/h
7.3s
6.8s
0-200 km/h
31.0s
Calculated
29.2s
Calculated
0-60 mph
6.9s
Calculated
6.4s
Calculated
Fuel consumption
5.4L/100 km43.6mpg US52.3mpg UK
8.1L/100 km29mpg US34.9mpg UK
Fuel consumption city
6.6L/100 km35.6mpg US42.8mpg UK
11.7L/100 km20.1mpg US24.1mpg UK
Fuel consumption highway
4.7L/100 km50mpg US60.1mpg UK
6L/100 km39.2mpg US47.1mpg UK
Quarter mile
15.2s
Calculated
14.8s
Calculated
Power-to-weight
127hp/t95kW/t58hp/1000 lb
Calculated
144hp/t108kW/t65hp/1000 lb
Calculated
Torque-to-weight
262Nm/t176lb-ft/ton
Calculated
179Nm/t120lb-ft/ton
Calculated
Estimated range
1,056km656mi
Calculated
654km407mi
Calculated
Displacement
1,995cc122cu in
2,996cc183cu in
Length
4,638mm183in
4,360mm172in
Width
1,825mm72in
1,748mm69in
Height
1,384mm54in
1,411mm56in
Wheelbase
2,810mm111in
2,660mm105in
Front track
1,545mm61in
1,474mm58in
Rear track
1,594mm63in
1,507mm59in
Ground clearance
130mm5in
140mm6in
Trunk volume
370L
260L
Max trunk volume-
305L
Doors
2
2
Seats
4
4
Fuel tank
57L
53L
CO2 emissions
142g/km
195g/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 (F33) 425dBMW 1 Series Convertible (E88) 125iPowerTorque
  • BMW 4 Series Convertible (F33) 425d: Power / Torque
  • BMW 1 Series Convertible (E88) 125i: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW4 Series Convertible (F33)425d4,400 rpm1,500-2,500 rpm4,650 rpm
BMW1 Series Convertible (E88)125i6,100 rpm2,500-4,250 rpm6,350 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW4 Series Convertible (F33)425dBMW1 Series Convertible (E88)125i
Acceleration checkpoints
0-60 mph
0-97 km/h
6.9 s
6.4 s
0-100 km/h
0-62 mph
7.3 s
6.8 s
0-200 km/h
0-124 mph
31.0 s
29.2 s
Top speed
241 km/h
150 mph
238 km/h
148 mph
Drag race simulation
60 ft
18 m
2.5 s
2.4 s
330 ft
101 m
6.6 s
6.4 s
1/8 mile
201 m
9.9 s
9.7 s
1000 ft
305 m
12.8 s
12.5 s
1/4 mile
402 m
15.2 s
14.8 s
Trap speed
1/4 mile
402 m
151 km/h
94 mph
154 km/h
96 mph

Power comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (F33)425d
218 hp
163 kW
BMW1 Series Convertible (E88)125i
218 hp
163 kW

Torque comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (F33)425d
450 Nm
332 lb-ft
BMW1 Series Convertible (E88)125i
270 Nm
199 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (F33)425d
1,715 kg
3,781 lb
BMW1 Series Convertible (E88)125i
1,510 kg
3,329 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 (F33)425d
241 km/h
150 mph
BMW1 Series Convertible (E88)125i
238 km/h
148 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 (F33)425d7.3 s
BMW1 Series Convertible (E88)125i6.8 s

The biggest 0-100 km/h difference is between BMW 1 Series Convertible (E88) 125i and BMW 4 Series Convertible (F33) 425d: 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
VehicleValue
BMW4 Series Convertible (F33)425d
5.4 L/100 km
43.6 mpg US
52.3 mpg UK
BMW1 Series Convertible (E88)125i
8.1 L/100 km
29.0 mpg US
34.9 mpg UK

The biggest fuel consumption difference is between BMW 4 Series Convertible (F33) 425d and BMW 1 Series Convertible (E88) 125i: 2.7 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 (F33)425d
127 hp/t
95 kW/t
7.9 kg/hp
BMW1 Series Convertible (E88)125i
144 hp/t
108 kW/t
6.9 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (F33)425d
1,056 km
656 mi
BMW1 Series Convertible (E88)125i
654 km
407 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW4 Series Convertible (F33)425d
218 hp
163 kW
7.3 s
241 km/h
150 mph
BMW1 Series Convertible (E88)125i
218 hp
163 kW
6.8 s
238 km/h
148 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 (F33)425d
Power
218 hp
163 kW
0-100 km/h7.3 s
Top speed
241 km/h
150 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
BMW1 Series Convertible (E88)125i
Power
218 hp
163 kW
0-100 km/h6.8 s
Top speed
238 km/h
148 mph
Doors/seats
2 doors
4 seats
Trunk
260 L
9.2 cu ft
Length
4,360 mm
171.7 in
Height
1,411 mm
55.6 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 (F33)425d
Power
218 hp
163 kW
0-100 km/h7.3 s
Top speed
241 km/h
150 mph
5.4 L/100 km
43.6 mpg US
52.3 mpg UK
BMW1 Series Convertible (E88)125i
Power
218 hp
163 kW
0-100 km/h6.8 s
Top speed
238 km/h
148 mph
8.1 L/100 km
29.0 mpg US
34.9 mpg UK

BMW 4 Series Convertible (F33) 425d 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 (F33)425d
5.4 L/100 km
43.6 mpg US
52.3 mpg UK
7.3 s
BMW1 Series Convertible (E88)125i
8.1 L/100 km
29.0 mpg US
34.9 mpg UK
6.8 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 (F33)425d
127 hp/t
95 kW/t
7.9 kg/hp
5.4 L/100 km
43.6 mpg US
52.3 mpg UK
BMW1 Series Convertible (E88)125i
144 hp/t
108 kW/t
6.9 kg/hp
8.1 L/100 km
29.0 mpg US
34.9 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW4 Series Convertible (F33)425dBMW1 Series Convertible (E88)125i
Power
218 hp
163 kW
218 hp
163 kW
Torque
450 Nm
332 lb-ft
270 Nm
199 lb-ft
Acceleration
7.3 s
6.8 s
Top speed
241 km/h
150 mph
238 km/h
148 mph
Lightness
1,715 kg
3,781 lb
1,510 kg
3,329 lb
Fuel consumption
5.4 L/100 km
43.6 mpg US
52.3 mpg UK
8.1 L/100 km
29.0 mpg US
34.9 mpg UK
Practicality
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
Doors/seats
2 doors
4 seats
Trunk
260 L
9.2 cu ft
Length
4,360 mm
171.7 in
Height
1,411 mm
55.6 in
Range score
1,056 km
656 mi
654 km
407 mi
CO2 score
142 g/km
195 g/km
Trunk score
370 L
13.1 cu ft
260 L
9.2 cu ft
Power-to-weight score
127 hp/t
95 kW/t
7.9 kg/hp
144 hp/t
108 kW/t
6.9 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 (F33) 425dBMW 1 Series Convertible (E88) 125i
Consumption5.4 L/100 km43.6 mpg US52.3 mpg UK8.1 L/100 km29 mpg US34.9 mpg UK
Cost / 100 km9.45 LC100 km14.17 LC100 km
Cost / 100 mi15.21 LC100 mi22.81 LC100 mi
Annual fuel used810 L214 US gal178 UK gal1,215 L321 US gal267 UK gal
Annual fuel cost1,418 LC/year2,126 LC/year

Head-to-head comparisons

BMW 4 Series Convertible (F33) 425d

  • Has 180 Nm more
  • Has 3 km/h (2 mph) higher top speed
  • Uses 2.7 L/100 km less fuel
  • Has 401 km (249 mi) more estimated range
  • Has 110 L more trunk volume
  • Emits 53 g/km less CO2

Pros

  • Highest top speed
  • Most powerful
  • Highest torque
  • Lowest combined fuel consumption
  • Best estimated range
  • Largest trunk

Cons

  • Slowest 0-100 km/h
  • Heaviest

BMW 1 Series Convertible (E88) 125i

  • Is 205 kg lighter
  • Is 0.5 s quicker from 0-100 km/h
  • Has 17 hp/t better power-to-weight

Pros

  • Quickest 0-100 km/h in this comparison
  • Lightest
  • Best power-to-weight ratio

Cons

  • Highest combined fuel consumption
  • Lowest top speed
  • Smallest trunk
  • Highest CO2 emissions

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 4 Series Convertible (F33) 425d
BMW 1 Series Convertible (E88) 125i
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