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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
Volkswagen Caddy Maxi 2.0 EcoFuel 109PS Life 2.08 157 7.55 37 £18,063
Peugeot RCZ 1.6 THP Level 1 156 2.19 155 7.06 40 £20,328
Renault Clio 3 Door 1.2 16V I-Music Special Edition 100 Turbo 2.22 129 5.80 49 £12,191
Renault Clio 5 Door 1.2 TCe 16V 20th Special Edition 100 2.22 129 5.80 49 £14,671
Renault Clio Sport Tourer 1.2 TCe 16V Expression 100 2.22 129 5.80 49 £12,942
Volkswagen Tiguan 2.0 TSI R Line 4MOTION 200PS 2.23 199 8.91 32 £26,635
Vauxhall Insignia Saloon 2.0i Turbo SE 2.24 197 8.80 32 £24,355
Skoda Octavia Estate 1.4 TSI Elegance 2.24 148 6.60 43 £16,415
SEAT Ibiza SC 1.6 16V Sport 105PS DSG 2.24 139 6.19 46 £13,110
SEAT Altea 1.6 Emocion S 2.25 173 7.70 37 £15,240
 

Bottom 10 CO2/litre petrol cars

 
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
BMW 3 Series Convertible New 325i M Sport 2.98 176 5.90 48 £38,040
BMW 3 Series Convertible New 330i M Sport 2.94 182 6.19 46 £41,425
BMW 3 Series Convertible New 325i M Sport Auto 2.93 185 6.31 45 £39,621
BMW 3 Series Convertible New 330i M Sport Auto 2.93 190 6.49 44 £43,046
BMW X6 xDrive35i 2.89 292 10.09 28 £44,375
Peugeot 308 SW 1.6 VTi S 120 5seat Auto 2.82 178 6.31 45 £18,145
Peugeot 207 3 Door 1.6 VTi S16 120 Special Edition 2.78 139 5.00 57 £14,695
Peugeot 207 5 Door 1.6 VTi Sport 120 2.78 139 5.00 57 £14,895
Fiat Punto Evo 3 door 1.3 16v Multijet 75HP Active 2.63 108 4.10 69 £12,995
Fiat Punto Evo 5 door 1.3 16v Multijet 75HP Active 2.63 108 4.10 69 £13,595

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