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 0.9 TwinAir City Cross 85HP 1.40 106 7.59 37.2 £15,125
Citroen C1 VTi 72 S&S Airscape Feel 5-door 1.57 85 5.41 52.2 £13,700
Fiat 500 1.0 Launch Edition Mild Hybrid 70HP 1.60 88 5.50 51.4 £16,795
Fiat 500C 1.0 Launch Edition Mild Hybrid 70HP 1.60 88 5.50 51.4 £19,445
Fiat Panda Cross 1.0 City Cross Mild Hybrid 70HP 1.61 90 5.60 50.4 £13,885
Citroen C5 Aircross SUV PureTech 130 S&S Flair EAT8 1.63 116 7.13 39.6 £28,335
BMW 2 Series Gran Tourer 220i Luxury Sport-Auto 1.65 129 7.80 36.2 £32,905
BMW 2 Series Active Tourer 220i Luxury Sport-Auto 1.66 123 7.39 38.2 £31,220
Lamborghini Huracan EVO Spyder 5.2 V10 MPI 640 Auto 1.67 285 17.02 16.6 £326,000
Lamborghini Aventador S 6.5 V12 LP 700-4 Coupe Auto 1.68 370 22.07 12.8 £279,000
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
Jeep Grand Cherokee 6.2 V8 HEMI TrackHawk Supercharged Auto 2.87 395 13.78 20.5 £89,999
Aston Martin Vantage 4.0 V8 Vantage AMR 59 503hp Auto 2.76 285 10.31 27.4 £164,995
Ford New Transit Connect Double Cab-in-Van 1.0 EcoBoost 220 L1 Trend 100PS 2.60 146 5.60 50.4 £22,409
Jaguar XF Sportbrake 2.0 Petrol R-Sport 250PS RWD Auto 2.55 171 6.71 42.1 £44,340
Peugeot 3008 SUV 1.6L PureTech GT Line 180 EAT8 S&S 2.49 129 5.17 54.6 £32,865
Ford New Mustang Fastback 5.0 V8 Bullitt 459PS 2.43 287 11.82 23.9 £49,045
Morgan Roadster 3.0 V6 2.42 250 10.31 27.4 £55,074
Volkswagen Caddy Maxi Life 1.0 TSI 102PS 2.41 137 5.70 49.6 £24,627
Ford New Mustang Fastback 5.0 V8 55 Edition 449PS Auto 2.39 268 11.21 25.2 £48,145