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
Fiat Panda Cross 1.0 City Cross Mild Hybrid 70hp 1.61 90 5.60 50.4 £14,365
Rolls-Royce Phantom 6.75 V12 Auto 1.63 318 19.48 14.5 £364,300
Lamborghini Huracan EVO Spyder 5.2 V10 MPI 640 Auto 1.67 285 17.02 16.6 £326,110
Lamborghini Aventador S 6.5 V12 LP 700-4 Coupe Auto 1.68 370 22.07 12.8 £279,110
Lamborghini Aventador S Roadster 6.5 V12 LP 700-4 Roadster Auto 1.68 370 22.07 12.8 £310,109
Fiat Panda Cross 0.9 TwinAir Cross 4x4 85hp 1.70 129 7.59 37.2 £17,550
Mazda Mazda CX-30 2.0 GT Sport 180PS Skyactiv-X MHEV AWD Old 1.71 111 6.49 43.5 £31,845
Fiat Panda 0.9 TwinAir 4x4 85hp 1.72 129 7.49 37.7 £15,950
Fiat Panda 1.2 Easy 69hp 1.73 111 6.41 44.1 £11,315
Peugeot 508 Fastback 1.6L PureTech Allure 180 EAT8 S&S Old 1.74 112 6.42 44.0 £31,490
Bottom 10 CO2 per litre petrol cars
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
Ford Transit Connect Double Cab-in-Van 1.0 EcoBoost 220 L1 Trend 100PS 2.39 134 5.60 50.4 £23,446
Jaguar F-Type Convertible P575 R 575PS AWD Auto 2.36 252 10.70 26.4 £103,200
Jaguar F-Type Coupé P575 R 575PS AWD Auto 2.36 252 10.70 26.4 £98,110
Jaguar F-Type Coupé P450 R-Dynamic 450PS AWD Auto 2.33 252 10.82 26.1 £75,360
Jaguar F-Type Convertible P450 R-Dynamic 450PS AWD Auto 2.32 252 10.86 26.0 £80,840
Jaguar F-Type Coupé P450 R-Dynamic 450PS RWD Auto 2.31 244 10.54 26.8 £70,500
Subaru BRZ 2.0i SE Lux 2.31 196 8.48 33.3 £32,060
Mercedes-Benz SLC Roadster SLC 200 Final Edition 2.30 161 6.99 40.4 £37,145
Jaguar F-Type Convertible P450 R-Dynamic 450PS RWD Auto 2.30 244 10.62 26.6 £75,980
Alpina B3 Saloon 3.0 B3 BiTurbo 462hp Sport-Auto 2.28 224 9.81 28.8 £66,510