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
Citroen C1 VTi 72 S&S Airscape Feel 5-door Stock Only 1.57 85 5.41 52.2 £14,165
Fiat Panda Cross 1.0 City Cross Mild Hybrid 70HP 1.61 90 5.60 50.4 £14,230
Citroen C5 Aircross SUV PureTech 130 S&S Flair EAT8 1.63 116 7.13 39.6 £29,060
Rolls-Royce Phantom 6.75 V12 Auto 1.63 318 19.48 14.5 £364,230
BMW 2 Series Gran Tourer 220i Luxury Sport-Auto 1.65 129 7.80 36.2 £34,380
Fiat 500 1.0 Dolcevita Mild Hybrid 70HP 1.66 88 5.30 53.3 £18,850
Bottom 10 CO2 per litre petrol cars
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
Morgan Plus 4 2.0 2.89 205 7.10 39.8 £44,106
Jaguar XF Sportbrake 2.0 Petrol R-Sport 250PS RWD Auto 2.55 171 6.71 42.1 £44,790
Peugeot 3008 SUV 1.6L PureTech GT Line 180 EAT8 S&S 2.49 129 5.17 54.6 £33,730
Ford New Mustang Fastback 5.0 V8 Bullitt 459PS 2.43 287 11.82 23.9 £49,085
Morgan Roadster 3.0 V6 2.42 250 10.31 27.4 £55,074
Ford New Mustang Fastback 5.0 V8 55 Edition 449PS Auto 2.39 268 11.21 25.2 £48,185
Mercedes-Benz GLC Coupé GLC 43 AMG Premium Plus 4MATIC+ 9G-TRONIC PLUS 2.38 240 10.09 28.0 £60,275
Mercedes-Benz GLC GLC 43 AMG Premium 4MATIC+ 9G-TRONIC PLUS 2.37 242 10.20 27.7 £54,420
Ford Fiesta 3 Door 1.0T EcoBoost ST-Line X Edition 125PS Old 2.36 104 4.40 64.2 £20,990
Ford Fiesta 5 Door 1.0T EcoBoost ST-Line X Edition 125PS 2.36 104 4.40 64.2 £21,390