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Car CO2 and fuel economy figures for BMW vehicles

Our car CO2 and fuel economy calculator uses independent data from EQUA Index to provide real-world driving figures compared to official manufacturer mpg rates.
To start, choose a car type or vehicle make
CO2 :
Manufacturer Derivative Official CO2 Equa CO2 Official MPG Equa MPG BIK Price
BMW 4 Series 420 Convertible 2.0i 184 SS M Sport 6Spd 17MY 153g/km D2 42.8 34.7 £38,425
BMW 4 Series 420 Convertible 2.0i 184 SS M Sport Auto8 17MY 144g/km D3 45.6 33.9 £40,115
BMW 4 Series 420 Convertible 2.0i 184 SS Sport 6Spd 17MY 153g/km D2 42.8 34.7 £37,075
BMW 4 Series 420 Convertible 2.0i 184 SS Sport Auto8 17MY 144g/km D3 45.6 33.9 £38,765
BMW 4 Series 420 Convertible 2.0i 184 SS Sport Professional Media 6Spd 17MY 153g/km D2 42.8 34.7 £37,975
BMW 4 Series 420 Convertible 2.0i 184 SS Sport Professional Media Auto8 17MY 144g/km D3 45.6 33.9 £39,665
BMW 4 Series 430 Convertible 2.0i 252 SS M Sport 6Spd 17MY 162g/km E2 40.4 32.7 £41,235
BMW 4 Series 430 Convertible 2.0i 252 SS M Sport Auto8 17MY 146g/km E4 44.8 31.8 £42,925
BMW 4 Series 440 Convertible 3.0i 326 SS M Sport Auto8 17MY 167g/km F4 39.2 28.4 £48,080
BMW 4 Series 420 Convertible 2.0d 190 SS M Sport Auto8 17MY 124g/km C3 60.1 43.2 £42,635
BMW 4 Series 420 Convertible 2.0d 190 SS M Sport 6Spd 17MY 134g/km C1 55.4 45.4 £40,945
BMW 4 Series 420 Convertible 2.0d 190 SS Sport Auto8 17MY 124g/km C3 60.1 43.2 £41,285
BMW 4 Series 420 Convertible 2.0d 190 SS Sport 6Spd 17MY 134g/km C1 55.4 45.4 £39,595
BMW 4 Series 420 Convertible 2.0d 190 SS Sport Professional Media Auto8 17MY 124g/km C3 60.1 43.2 £42,185
BMW 4 Series 420 Convertible 2.0d 190 SS Sport Professional Media 6Spd 17MY 134g/km C1 55.4 45.4 £40,495
BMW 4 Series 430 Convertible 3.0d 258 SS M Sport Auto8 17MY 144g/km D3 51.4 37.8 £46,250
BMW 4 Series 435 xDrive Convertible 3.0d 313 SS M Sport Auto8 17MY 155g/km E4 47.9 33.5 £50,115
BMW 4 Series M4 Convertible 3.0 Bi T 431 SS 6Spd 17MY 213g/km G1 31.0 26.3 £61,205
BMW 4 Series M4 Convertible 3.0 Bi T 431 SS DCT Auto7 17MY 203g/km G2 32.5 25.4 £63,850
BMW 4 Series M4 Convertible 3.0 Bi T 450 SS Competition Pack 6Spd 17MY 213g/km G1 31.0 25.7 £63,405
BMW 4 Series M4 Convertible 3.0 Bi T 450 SS Competition Pack DCT Auto7 17MY 203g/km G3 32.5 24.8 £66,050
BMW 4 Series 420 Convertible 2.0i 184 SS M Sport 6Spd 17.5MY 153g/km - 42.8 - £39,055
BMW 4 Series 420 Convertible 2.0i 184 SS M Sport Auto8 17.5MY 144g/km - 45.6 - £40,745
BMW 4 Series 420 Convertible 2.0i 184 SS Sport 6Spd 17.5MY 153g/km - 42.8 - £37,705
BMW 4 Series 420 Convertible 2.0i 184 SS Sport Auto8 17.5MY 144g/km - 45.6 - £39,395
BMW 4 Series 420 Convertible 2.0i 184 SS Sport Professional Media 6Spd 17.5MY 153g/km - 42.8 - £38,605
BMW 4 Series 420 Convertible 2.0i 184 SS Sport Professional Media Auto8 17.5MY 144g/km - 45.6 - £40,295
BMW 4 Series 420 Convertible 2.0d 190 SS M Sport Auto8 17.5MY 124g/km - 60.1 - £43,295
BMW 4 Series 420 Convertible 2.0d 190 SS M Sport 6Spd 17.5MY 134g/km - 55.4 - £41,605
BMW 4 Series 420 Convertible 2.0d 190 SS Sport Auto8 17.5MY 124g/km - 60.1 - £41,945
BMW 4 Series 420 Convertible 2.0d 190 SS Sport 6Spd 17.5MY 134g/km - 55.4 - £40,255
BMW 4 Series 420 Convertible 2.0d 190 SS Sport Professional Media Auto8 17.5MY 124g/km - 60.1 - £42,845
BMW 4 Series 420 Convertible 2.0d 190 SS Sport Professional Media 6Spd 17.5MY 134g/km - 55.4 - £41,155
BMW 4 Series 430 Convertible 2.0i 252 SS M Sport 6Spd 17.5MY 162g/km - 40.4 - £41,915
BMW 4 Series 430 Convertible 2.0i 252 SS M Sport Auto8 17.5MY 146g/km - 44.8 - £43,605
BMW 4 Series 430 Convertible 3.0d 258 SS M Sport Auto8 17.5MY 144g/km - 51.4 - £47,000
BMW 4 Series 440 Convertible 3.0i 326 SS M Sport Auto8 17.5MY 167g/km - 39.2 - £48,850
BMW 4 Series 435 xDrive Convertible 3.0d 313 SS M Sport Auto8 17.5MY 155g/km - 47.9 - £50,945
BMW 4 Series M4 Convertible 3.0 Bi T 431 SS 6Spd 17.5MY 218g/km - 29.7 - £61,925
BMW 4 Series M4 Convertible 3.0 Bi T 431 SS DCT Auto7 17.5MY 203g/km - 32.5 - £64,570
Data isn't available for all vehicle derivatives

How the Equa CO2 index works

The Equa CO2 Index provides a rating from A++ to H, allowing comparison between vehicles regardless of fuel type.

It also shows how close a vehicle gets to the official figures on a scale of 1-5.

For example A1 would be the least polluting car (A) with the most accurate official CO2 results (1).

H5 is the worst polluter (H) and furthest from the official number (5).

RatingFrom g/km CO2To g/km CO2
A-125
B125150
C150175
D175200
E200225
F225250
G250275
H275 -

Car CO2 Emissions and Real World Economy Calculator

Our tool allows you to compare official mpg figures provided by manufacturers and mpg figures provided by Emissions Analytics and its EQUA Index ratings gained through multiple repeats of rural, urban and extra-urban roads using a portable measuring system, recording tailpipe emissions.

Calculate CO2 car emissions with the Fleet News CO2 emissions calculator to find the lowest emitting vehicles available on the market today.

The environment is becoming more central to how we do business as more and more companies are looking to reduce CO2 emissions across their fleets.

Here at Fleet News we have a co2 emissions calculator to help businesses calculate their fleet CO2 emissions.

Calculate car co2 emissions today with the Fleet News Car CO2 Emissions Calculator.