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
Honda Civic 5 Door 1.0 VTEC Turbo Sport Line 126PS CVT 1.60 107 6.69 42.2 £24,150
Honda Civic 4 Door 1.0 VTEC Turbo EX 126PS CVT 1.65 107 6.49 43.5 £26,010
Honda Civic 5 Door 1.0 VTEC Turbo SE 126PS CVT 1.65 107 6.49 43.5 £20,805
BMW 2 Series Gran Tourer 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 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
Porsche Panamera 2.9 V6 4S Executive PDK 1.67 187 11.21 25.2 £103,325
BMW 2 Series Gran Tourer 220i M Sport Sport-Auto 1.68 131 7.80 36.2 £33,945
BMW 2 Series Active Tourer 220i SE Auto 1.69 123 7.30 38.7 £29,040
Bottom 10 CO2 per litre petrol cars
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
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
Alfa Romeo Giulietta 1.4 TB Nero Edizione 120hp 2.65 164 6.19 45.6 £23,285
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
Jaguar XF Sportbrake 2.0 Petrol R-Sport 250PS RWD Auto 2.55 171 6.71 42.1 £44,340
Ford New Mustang Convertible 5.0 V8 55 Edition 450PS 2.52 305 12.12 23.3 £49,045
Morgan Aero 8 4.8 V8 2.52 282 11.21 25.2 £102,140
Ford New Mustang Fastback 5.0 V8 55 Edition 450PS 2.51 297 11.82 23.9 £45,545