Kg CO2 per litre of petrol

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 petrol cars
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
Vauxhall Insignia Sports Tourer 1.6 (200PS) SRi VX-Line Nav Turbo 1.75 152 8.69 32.5 £27,440
Skoda Citigo 3 Door 1.0 MPI Colour Edition 60PS 1.84 101 5.50 51.4 £10,820
Skoda Citigo 5 Door 1.0 MPI Colour Edition 60PS 1.84 101 5.50 51.4 £11,180
Skoda Citigo 3 Door 1.0 MPI SE 60PS ASG Auto 1.89 100 5.30 53.3 £10,460
Skoda Citigo 5 Door 1.0 MPI SE 60PS ASG Auto 1.89 100 5.30 53.3 £10,810
Skoda Citigo 3 Door 1.0 MPI SE L 75PS ASG Auto 1.94 103 5.30 53.3 £11,420
Skoda Citigo 5 Door 1.0 MPI SE L 75PS ASG Auto 1.94 103 5.30 53.3 £11,770
Skoda Citigo 3 Door 1.0 MPI SE 60PS GreenTech 1.96 96 4.90 57.7 £10,135
Skoda Citigo 5 Door 1.0 MPI SE 60PS GreenTech 1.96 96 4.90 57.7 £10,485
BMW 5 Series Touring 530i SE Sport-Auto 2.14 133 6.21 45.5 £44,150
Bottom 10 CO2 per litre petrol cars
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
Mazda Mazda CX-3 2.0 Sport Nav+ 150PS AWD 3.64 160 4.40 64.2 £23,795
BMW X4 New xDrive M40i Auto 3.20 205 6.41 44.1 £55,725
Mercedes-Benz GLA-Class GLA 180 Urban Edition 2.77 158 5.70 49.6 £25,105
Mercedes-Benz CLA-Class Coupé CLA 180 AMG Line Edition 2.77 152 5.50 51.4 £27,095
Mercedes-Benz CLA-Class Shooting Brake CLA 180 AMG Line Edition 2.72 158 5.80 48.7 £27,945
Ford Kuga 1.5T EcoBoost Zetec 182PS AWD Auto 2.72 204 7.49 37.7 £28,835
DS DS 3 1.2 PureTech Connected Chic 110hp S&S EAT6 2.71 119 4.39 64.3 £19,210
Citroen C3 Aircross SUV New 1.2 PureTech Feel 130hp S&S 2.70 119 4.40 64.2 £17,395
BMW M4 Convertible M4 Convertible DCT 2.68 233 8.69 32.5 £67,810
Mercedes-Benz CLA-Class Coupé CLA 200 AMG Line Edition DCT 2.66 146 5.50 51.4 £29,910