Car comparison

BMW 6 Series Convertible (F12) 640ivsBMW 1 Series Convertible (E88) 135i

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

New comparison

BMW 6 Series Convertible (F12)

640i

320 hp2979 ccGasolineAWDAutomaticTurbochargedCabriolet / convertible2013-2015
VS

BMW 1 Series Convertible (E88)

135i

306 hp2979 ccGasolineRWDAutomaticTwin-turboCabriolet / convertible2008-2010

Comparison overview

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

Best choices

BMW 6 Series Convertible (F12) 640i

  • Quickest 0-100 km/h
    5.4 s
  • Fastest top speed
    260 km/h
    162 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Most powerful
    320 hp
    239 kW
  • Highest torque
    450 Nm
    332 lb-ft
  • Lowest combined fuel consumption
    8.4 L/100 km
    28.0 mpg US
    33.6 mpg UK
  • Lowest city consumption
    11.4 L/100 km
    20.6 mpg US
    24.8 mpg UK
  • Lowest highway consumption
    6.6 L/100 km
    35.6 mpg US
    42.8 mpg UK
  • Best estimated range
    833 km
    518 mi
  • Largest trunk
    300 L
  • Best overall score
    59/100
  • Best performance score
    66/100
  • Best economy score
    84/100
  • Best practicality score
    45/100

Specification comparison

Specification comparison
ModelBMW6 Series Convertible (F12)640iBMW1 Series Convertible (E88)135i
Power
320hp239kW
306hp228kW
Torque
450Nm332lb-ft
400Nm295lb-ft
Curb weight
1,910kg4,211lb
1,610kg3,549lb
Gross weight
2,400kg5,291lb
2,050kg4,519lb
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
To 99% top speed
79.8s99% target: 257 km/h / 160 mph
Calculated
80.5s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
5.4s
5.7s
0-200 km/h
20.3s
Calculated
20.9s
Calculated
0-60 mph
5.1s
Calculated
5.4s
Calculated
Fuel consumption
8.4L/100 km28mpg US33.6mpg UK
9.4L/100 km25mpg US30.1mpg UK
Fuel consumption city
11.4L/100 km20.6mpg US24.8mpg UK
13.5L/100 km17.4mpg US20.9mpg UK
Fuel consumption highway
6.6L/100 km35.6mpg US42.8mpg UK
7L/100 km33.6mpg US40.4mpg UK
Quarter mile
13.6s
Calculated
13.8s
Calculated
Power-to-weight
168hp/t125kW/t76hp/1000 lb
Calculated
190hp/t142kW/t86hp/1000 lb
Calculated
Torque-to-weight
236Nm/t158lb-ft/ton
Calculated
248Nm/t166lb-ft/ton
Calculated
Estimated range
833km518mi
Calculated
564km350mi
Calculated
Displacement
2,979cc182cu in
2,979cc182cu in
Length
4,894mm193in
4,360mm172in
Width
1,894mm75in
1,748mm69in
Height
1,365mm54in
1,411mm56in
Wheelbase
2,855mm112in
2,660mm105in
Front track
1,600mm63in
1,474mm58in
Rear track
1,665mm66in
1,507mm59in
Ground clearance
123mm5in
140mm6in
Trunk volume
300L
260L
Max trunk volume
350L
305L
Doors
2
2
Seats
4
4
Fuel tank
70L
53L
CO2 emissions
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 6 Series Convertible (F12) 640iBMW 1 Series Convertible (E88) 135iPowerTorque
  • BMW 6 Series Convertible (F12) 640i: Power / Torque
  • BMW 1 Series Convertible (E88) 135i: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW6 Series Convertible (F12)640i5,800-6,000 rpm1,300-4,500 rpm6,250 rpm
BMW1 Series Convertible (E88)135i5,800 rpm1,300-5,000 rpm6,050 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW6 Series Convertible (F12)640iBMW1 Series Convertible (E88)135i
Acceleration checkpoints
0-60 mph
0-97 km/h
5.1 s
5.4 s
0-100 km/h
0-62 mph
5.4 s
5.7 s
0-200 km/h
0-124 mph
20.3 s
20.9 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Likely limited
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Limited
Drag race simulation
60 ft
18 m
2.2 s
2.3 s
330 ft
101 m
5.9 s
6.0 s
1/8 mile
201 m
8.8 s
9.0 s
1000 ft
305 m
11.4 s
11.6 s
1/4 mile
402 m
13.6 s
13.8 s
Trap speed
1/4 mile
402 m
169 km/h
105 mph
167 km/h
104 mph

Power comparison

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

Chart data table
VehicleValue
BMW6 Series Convertible (F12)640i
320 hp
239 kW
BMW1 Series Convertible (E88)135i
306 hp
228 kW

BMW 6 Series Convertible (F12) 640i has 14 hp more than BMW 1 Series Convertible (E88) 135i.

The biggest power difference is between BMW 1 Series Convertible (E88) 135i and BMW 6 Series Convertible (F12) 640i: 14 hp (10 kW).

Torque comparison

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

Chart data table
VehicleValue
BMW6 Series Convertible (F12)640i
450 Nm
332 lb-ft
BMW1 Series Convertible (E88)135i
400 Nm
295 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMW6 Series Convertible (F12)640i
1,910 kg
4,211 lb
BMW1 Series Convertible (E88)135i
1,610 kg
3,549 lb

Top speed without limiter comparison

Bar comparison chart for Top speed without limiter. Higher is better · km/h / mph

Chart data table
VehicleValue
BMW6 Series Convertible (F12)640i
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW1 Series Convertible (E88)135i
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph

0-100 km/h comparison

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

Chart data table
VehicleValue
BMW6 Series Convertible (F12)640i5.4 s
BMW1 Series Convertible (E88)135i5.7 s

The biggest 0-100 km/h difference is between BMW 6 Series Convertible (F12) 640i and BMW 1 Series Convertible (E88) 135i: 0.3 s.

Fuel consumption comparison

Bar comparison chart for Fuel consumption. Lower is better · L/100 km / mpg US / mpg UK

Chart data table
VehicleValue
BMW6 Series Convertible (F12)640i
8.4 L/100 km
28.0 mpg US
33.6 mpg UK
BMW1 Series Convertible (E88)135i
9.4 L/100 km
25.0 mpg US
30.1 mpg UK

The biggest fuel consumption difference is between BMW 6 Series Convertible (F12) 640i and BMW 1 Series Convertible (E88) 135i: 1.0 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
BMW6 Series Convertible (F12)640i
168 hp/t
125 kW/t
6.0 kg/hp
BMW1 Series Convertible (E88)135i
190 hp/t
142 kW/t
5.3 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMW6 Series Convertible (F12)640i
833 km
518 mi
BMW1 Series Convertible (E88)135i
564 km
350 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW6 Series Convertible (F12)640i
320 hp
239 kW
5.4 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW1 Series Convertible (E88)135i
306 hp
228 kW
5.7 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 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
BMW6 Series Convertible (F12)640i
Power
320 hp
239 kW
0-100 km/h5.4 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk
300 L
10.6 cu ft
Length
4,894 mm
192.7 in
Height
1,365 mm
53.7 in
BMW1 Series Convertible (E88)135i
Power
306 hp
228 kW
0-100 km/h5.7 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 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
BMW6 Series Convertible (F12)640i
Power
320 hp
239 kW
0-100 km/h5.4 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
8.4 L/100 km
28.0 mpg US
33.6 mpg UK
BMW1 Series Convertible (E88)135i
Power
306 hp
228 kW
0-100 km/h5.7 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
9.4 L/100 km
25.0 mpg US
30.1 mpg UK

BMW 6 Series Convertible (F12) 640i 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
BMW6 Series Convertible (F12)640i
8.4 L/100 km
28.0 mpg US
33.6 mpg UK
5.4 s
BMW1 Series Convertible (E88)135i
9.4 L/100 km
25.0 mpg US
30.1 mpg UK
5.7 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
BMW6 Series Convertible (F12)640i
168 hp/t
125 kW/t
6.0 kg/hp
8.4 L/100 km
28.0 mpg US
33.6 mpg UK
BMW1 Series Convertible (E88)135i
190 hp/t
142 kW/t
5.3 kg/hp
9.4 L/100 km
25.0 mpg US
30.1 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW6 Series Convertible (F12)640iBMW1 Series Convertible (E88)135i
Power
320 hp
239 kW
306 hp
228 kW
Torque
450 Nm
332 lb-ft
400 Nm
295 lb-ft
Acceleration
5.4 s
5.7 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Lightness
1,910 kg
4,211 lb
1,610 kg
3,549 lb
Fuel consumption
8.4 L/100 km
28.0 mpg US
33.6 mpg UK
9.4 L/100 km
25.0 mpg US
30.1 mpg UK
Practicality
Doors/seats
2 doors
4 seats
Trunk
300 L
10.6 cu ft
Length
4,894 mm
192.7 in
Height
1,365 mm
53.7 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
833 km
518 mi
564 km
350 mi
CO2 score
195 g/km
-
Trunk score
300 L
10.6 cu ft
260 L
9.2 cu ft
Power-to-weight score
168 hp/t
125 kW/t
6.0 kg/hp
190 hp/t
142 kW/t
5.3 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 6 Series Convertible (F12) 640iBMW 1 Series Convertible (E88) 135i
Consumption8.4 L/100 km28 mpg US33.6 mpg UK9.4 L/100 km25 mpg US30.1 mpg UK
Cost / 100 km14.70 LC100 km16.45 LC100 km
Cost / 100 mi23.66 LC100 mi26.47 LC100 mi
Annual fuel used1,260 L333 US gal277 UK gal1,410 L372 US gal310 UK gal
Annual fuel cost2,205 LC/year2,468 LC/year

Head-to-head comparisons

BMW 6 Series Convertible (F12) 640i

  • Has 14 hp more
  • Has 50 Nm more
  • Is 0.3 s quicker from 0-100 km/h
  • Uses 1.0 L/100 km less fuel
  • Has 270 km (167 mi) more estimated range
  • Has 40 L more trunk volume

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Most powerful
  • Highest torque
  • Lowest combined fuel consumption
  • Best estimated range
  • Largest trunk

Cons

  • Heaviest

BMW 1 Series Convertible (E88) 135i

  • Is 300 kg lighter
  • Has 23 hp/t better power-to-weight

Pros

  • Lightest
  • Best power-to-weight ratio

Cons

  • Slowest 0-100 km/h
  • Lowest power
  • Highest combined fuel consumption
  • Smallest trunk

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 6 Series Convertible (F12) 640i
BMW 1 Series Convertible (E88) 135i
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