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
Renault Twingo 0.9 TCe 100 GT 2.21 115 5.20 54.3 £13,755
Ford Mustang Fastback 5.0 V8 GT 418PS 2.21 299 13.52 20.9 £35,745
Renault Clio New 1.2 TCe Dynamique Nav 120 Auto 2.22 120 5.40 52.3 £17,215
Renault Megane Hatch New 1.2 TCe Dynamique Nav 130 2.22 120 5.40 52.3 £18,750
Renault Megane Sport Tourer New 1.2 TCe Dynamique Nav 130 2.22 120 5.40 52.3 £20,050
Mercedes-Benz C-Class Coupé C 200 Sport 7-speed G-Tronic 2.22 129 5.80 48.7 £33,335
Peugeot 3008 New 1.6L e-THP Allure 165 Auto S&S 2.22 129 5.80 48.7 £26,395
Renault Scenic New 1.2 TCe 115 Dynamique Nav 2.22 129 5.80 48.7 £22,945
Dacia Logan 0.9 TCe Ambiance 90hp 2.23 109 4.90 57.7 £8,595
Dacia Sandero 0.9 TCe Ambiance 90hp 2.23 109 4.90 57.7 £7,595
Bottom 10 CO2 per litre petrol cars
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
Volkswagen Beetle 2.0 TSI Sport 220PS BMT DSG 2.90 157 5.41 52.2 £25,540
Volkswagen Beetle Cabriolet New 1.2 TSI Dune 105PS BMT 2.69 129 4.80 58.9 £24,765
Volkswagen Caddy Life 1.4 TSI 125PS BMT 2.65 135 5.10 55.4 £20,903
Volkswagen Caddy Maxi Life 1.4 TSI 125PS BMT 2.65 135 5.10 55.4 £22,685
Volkswagen Caddy Life 1.4 TSI 125PS BMT DSG 2.63 129 4.90 57.6 £22,549
Volkswagen Caddy Life 1.2 TSI 84PS BMT 2.61 120 4.60 61.4 £19,717
Volkswagen Caddy Maxi Life 1.4 TSI 125PS BMT DSG 2.61 120 4.60 61.4 £24,331
Mercedes-Benz C-Class Coupé C 200 AMG Line 2.49 132 5.30 53.3 £33,460
Mercedes-Benz C-Class Saloon C 200 AMG Line 2.49 132 5.30 53.3 £32,165
Mercedes-Benz C-Class Saloon C 200 AMG Line 7-speed G-Tronic 2.47 131 5.30 53.3 £33,665