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
Mercedes-Benz C-Class Cabriolet C 43 AMG 4MATIC Premium MCT 2.00 194 9.71 29.1 £58,579
Vauxhall Crossland X 1.2 Elite 110PS Turbo S/S ecoTEC 2.14 107 5.00 56.5 £19,630
Volkswagen Tiguan 1.4 TSI ACT SE Navigation BMT 150 4MOTION 2.14 148 6.91 40.9 £28,610
Volkswagen Tiguan 1.4 TSI ACT SE Navigation BMT 150 4MOTION DSG 2.18 155 7.10 39.8 £30,410
Ford EcoSport New 1.0 EcoBoost ST-Line 125PS Auto 2.19 140 6.41 44.1 £22,045
McLaren 570GT 3.8 Twin-Turbo V8 570PS Auto 2.19 258 11.77 24.0 £157,005
Mercedes-Benz C-Class Saloon C 200 SE 9-speed G-Tronic 2.19 123 5.60 50.4 £30,640
Ford Mustang Convertible New 2.3 EcoBoost 290PS 2.19 200 9.11 31.0 £40,145
Ford Mustang Fastback New 2.3 EcoBoost 290PS 2.20 199 9.02 31.3 £36,645
Bottom 10 CO2 per litre petrol cars
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
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
Mercedes-Benz CLA-Class Coupé CLA 200 AMG Line Edition DCT 2.66 146 5.50 51.4 £29,910
Ford Kuga 1.5T EcoBoost ST-Line 150PS FWD (S/S) 2.63 176 6.69 42.2 £28,375
Toyota Auris Touring Sports New 1.2T VVT-i Design 2.63 126 4.80 58.9 £22,310
Mercedes-Benz CLA-Class Coupé CLA 200 AMG Line Edition 2.62 147 5.60 50.4 £28,310
Ford Kuga 1.5T EcoBoost Titanium 150PS FWD (S/S) 2.62 181 6.91 40.9 £26,775
Toyota Auris New 1.2T VVT-i Icon Auto 2.61 120 4.60 61.4 £21,160
SEAT Arona New 1.6 TSI XCELLENCE 95PS DSG 2.57 108 4.20 67.3 £23,805