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
BMW X5 xDrive40i xLine Auto 1.51 162 10.70 26.4 £59,045
BMW X5 xDrive40i M Sport Auto 1.60 166 10.39 27.2 £62,545
Honda Civic 5 Door 1.0 VTEC Turbo EX 126PS CVT 1.60 107 6.69 42.2 £25,210
Honda Civic 5 Door 1.0 VTEC Turbo Sport Line 126PS CVT 1.62 107 6.60 42.8 £23,850
Honda Civic 4 Door 1.0 VTEC Turbo EX 126PS CVT 1.65 107 6.49 43.5 £25,710
Honda Civic 5 Door 1.0 VTEC Turbo SR 126PS CVT 1.65 107 6.49 43.5 £22,350
BMW 2 Series Gran Tourer New 220i Luxury Sport-Auto 1.65 129 7.80 36.2 £32,945
Porsche Panamera Sport Turismo 2.9 V6 4S PDK 1.65 187 11.30 25.0 £97,041
BMW 2 Series Active Tourer New 220i Luxury Sport-Auto 1.66 123 7.39 38.2 £31,220
Hyundai KONA Hybrid 1.6 GDi Hybrid SE 141PS DCT 1.67 90 5.40 52.3 £22,495
Bottom 10 CO2 per litre petrol cars
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
Skoda Superb Estate 2.0 TSI SportLine Plus 272PS 4x4 DSG SCR 3.58 162 4.52 62.5 £38,045
Jeep Grand Cherokee 6.2 V8 HEMI TrackHawk Supercharged Auto 2.87 395 13.78 20.5 £89,999
MINI Clubman 2.0i Cooper S Sport 192hp 2.83 147 5.20 54.3 £26,790
MINI Clubman 2.0i Cooper S Exclusive 192hp 2.79 145 5.20 54.3 £26,790
Aston Martin Vantage 4.0 V8 Vantage AMR 59 503hp Auto 2.76 285 10.31 27.4 £164,995
Alfa Romeo Giulietta 1.4 TB Nero Edizione 120hp 2.65 164 6.19 45.6 £23,285
Ford Kuga 1.5T EcoBoost Titanium X 150PS FWD (S/S) 2.65 164 6.19 45.6 £29,275
Ford New Mustang Fastback 5.0 V8 55 Edition 450PS Auto 2.64 290 10.99 25.7 £47,545
Ford New Transit Connect Double Cab-in-Van 1.0 EcoBoost 220 L1 Trend 100PS 2.60 146 5.60 50.4 £22,229
Ford New Mustang Convertible 5.0 V8 55 Edition 450PS Auto 2.55 299 11.72 24.1 £51,045