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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. So these figures show how inaccurate the testing mechanism can be, and how different engines skew the results. The official tests measure exhaust gases only and then calculate the fuel consumption.
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Top 10 CO2/litre petrol cars

 
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
Lamborghini Gallardo 5.2 V10 LP 570-4 Super Trofeo Stradale Auto 1.81 319 17.66 16.0 £197,918
Ginetta G40R 2.0 G40R 1.86 181 9.74 29.0 £29,950
Ginetta G60 3.7 V6 G60 1.99 181 9.11 31.0 £68,000
Alpina B6 4.4 B6 Bi-Turbo Coupe Sport-Auto 2.03 244 12.02 23.5 £92,850
Maserati GranTurismo 4.7 V8 S Auto 2.03 354 17.44 16.2 £88,640
Alpina B6 4.4 B6 Bi-Turbo Convertible Sport-Auto 2.05 247 12.02 23.5 £97,850
Skoda Octavia Hatch 1.4 16V S 80PS 2.13 149 6.99 40.4 £13,280
Mercedes-Benz E-Class Saloon E 200 CGI BlueEFFICIENCY SE G-Tronic Plus 2.14 152 7.10 39.8 £31,105
Ford Mondeo Hatch 1.6 SCTi 160PS Edge Eco Boost Start Stop 2.17 149 6.87 41.1 £18,795
Citroen C3 1.6 VTi Exclusive 120hp Auto 2.19 153 6.99 40.4 £16,290
 

Bottom 10 CO2/litre petrol cars

 
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
Skoda Superb Hatch 2.0 T FSI Elegance 200PS DSG 2.82 178 6.31 44.8 £26,060
Skoda Superb Estate 2.0 T FSI Elegance 200PS DSG 2.81 180 6.41 44.1 £27,320
Lotus Evora 3.5 V6 2+2 2.78 210 7.55 37.4 £53,450
Fiat Doblo Combi New 1.3 Multijet 16v Diesel Active 2.63 129 4.90 57.6 £18,531
Mercedes-Benz C-Class Estate C 180 BlueEFFICIENCY Sport 2.59 176 6.81 41.5 £30,270
Mercedes-Benz C-Class Saloon C 180 BlueEFFICIENCY Sport 2.52 169 6.69 42.2 £29,020
Lamborghini Gallardo 5.2 V10 LP 560-4 Coupe Bicolore Auto 2.51 351 13.98 20.2 £161,268
Mercedes-Benz C-Class Saloon C 180 BlueEFFICIENCY Sport G-Tronic Plus 2.50 160 6.41 44.1 £30,420
Mercedes-Benz A-Class Hatchback A 160 Avantgarde SE Auto 2.48 164 6.60 42.8 £19,155
Mercedes-Benz C-Class Estate C 180 BlueEFFICIENCY Sport G-Tronic Plus 2.47 163 6.60 42.8 £31,620

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