Kg CO2 per litre of diesel

If you burn a litre of diesel this will produce 2.6391 kgs of carbon dioxide. Petrol has a lower carbon content and so produces 2.3035 kgs of CO2. The precise figures depend on the quality of the fuel. Since fuel weighs less than a kilogram per litre, it is interesting to see how the weight of emissions is multiplied by the addition of oxygen. The tables below show how the official test figures for CO2 emissions and combined MPG can be equated to see how individual vehicles perform in terms of CO2 per litre. Some cars appear to do better than the standard chemistry would suggest, whereas others do worse. The official tests measure exhaust gases only and then calculate the fuel consumption. So these figures show how far off the recording of test results can be due to errors, rounding differences, and the leeway of around 4% given to manufacturers to decide on which fuel consumption figure to use.

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Top 10 CO2 per litre diesel cars
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
BMW 7 Series 730d xDrive Sport-Auto 2.24 132 5.90 47.9 £70,340
Jaguar XE 2.0 Diesel Landmark 240PS AWD Auto 2.25 162 7.21 39.2 £44,130
Ford All-New Focus 2.0L EcoBlue ST-Line 150PS 2.26 115 5.10 55.4 £24,010
Mazda Mazda CX-5 2.0 Sport Nav+ 165PS SKYACTIV-D 2WD Auto 2.27 150 6.60 42.8 £29,795
Citroen C3 1.2 BlueHDi Feel Nav Edition 110hp S&S 2.28 107 4.70 60.1 £16,750
Ford All-New Fiesta 3 Door 1.5 TDCi Titanium X 120PS 2.28 107 4.70 60.1 £20,585
Vauxhall Astra Hatchback 1.6 CDTi Design 110PS ecoTEC BlueInjection 2.28 107 4.70 60.1 £19,870
Mazda Mazda CX-5 2.0 Sport Nav+ 165PS SKYACTIV-D 2WD 2.28 146 6.41 44.1 £28,295
Vauxhall Astra Hatchback 1.6 CDTi SRi 110PS S/S ecoTEC BlueInjection 2.29 110 4.80 58.9 £22,730
BMW 5 Series Saloon 520d SE Auto 2.34 117 5.01 56.4 £37,775
Bottom 10 CO2 per litre diesel cars
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
Mercedes-Benz CLA-Class Shooting Brake CLA 220 d AMG Line Night Edition DCT 3.43 144 4.20 67.3 £35,135
BMW X3 New xDrive M40d Sport-Auto 3.20 205 6.41 44.1 £52,455
Jeep Renegade New 1.0 MultiJet II 120hp Longitude 4x2 3.14 138 4.40 64.2 £21,700
Ford Mondeo Estate 2.0 TDCi ST-Line Edition 180PS AWD Powershift 3.11 165 5.30 53.3 £31,295
Ford Mondeo Vignale Estate 2.0 TDCi 180PS AWD Powershift 3.11 165 5.30 53.3 £33,595
Mercedes-Benz CLA-Class Shooting Brake CLA 220 d AMG Line Night Edition 4MATIC DCT 3.09 148 4.80 58.9 £36,735
Ford S-MAX Vignale 2.0 EcoBlue 240PS Auto 3.08 154 5.00 56.5 £40,195
Nissan Juke 1.5 dCi Acenta 110 3.07 123 4.00 70.6 £18,990
Vauxhall Astra Hatchback 1.6 CDTi Ultimate 150PS BiTurbo S/S 3.07 126 4.10 68.9 £28,030
Vauxhall Astra Sports Tourer 1.6 CDTi Elite Nav 150PS BiTurbo S/S 3.07 126 4.10 68.9 £26,580