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 City Cross 0.9 TwinAir 85HP 1.40 106 7.59 37.2 £15,025
Fiat Panda Waze 0.9 TwinAir 85HP 1.40 106 7.59 37.2 £14,115
Mercedes-Benz B-Class B 180 Sport 1.53 101 6.60 42.8 £27,360
Honda Civic 5 Door 1.0 VTEC Turbo Sport Line 126PS CVT 1.60 107 6.69 42.2 £24,150
SEAT Leon Estate SE Dynamic 1.5 TSI EVO 130PS 1.65 112 6.81 41.5 £20,770
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 £32,905
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
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
Volvo XC60 2.0 B5 (P) AWD Inscription Pro 250hp Automatic 2.66 162 6.10 46.3 £49,085
Alfa Romeo Giulietta 1.4 TB Nero Edizione 120hp 2.65 164 6.19 45.6 £23,285
Volvo XC60 2.0 B5 (P) AWD Inscription 250hp Automatic 2.62 160 6.10 46.3 £45,185
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 Fastback 5.0 V8 55 Edition 449PS Auto 2.59 290 11.21 25.2 £47,545
Ford New Mustang Convertible 5.0 V8 55 Edition 449PS Auto 2.58 299 11.58 24.4 £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 449PS 2.52 305 12.12 23.3 £49,045