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If you burn a litre of diesel this will produce around 2.62 kgs of carbon dioxide. Petrol has a lower carbon content and so produces around 2.39 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
Audi TT Roadster 1.8 TFSI 160PS 1.91 159 8.31 34 £23,915
Volkswagen Passat Estate 1.8 TSI Highline 160PS Auto 2.12 178 8.41 34 £21,925
Volkswagen Passat CC 3.6 V6 GT 300PS 2.17 219 10.09 28 £30,865
Mitsubishi i 0.7 MIVEC Turbo Auto 2.20 114 5.17 55 £9,149
SEAT Ibiza New 1.6 16V SE 105PS DSG 2.21 148 6.69 42 £12,460
SEAT Ibiza SC New 1.6 16V Sport 105PS DSG 2.21 148 6.69 42 £12,350
SEAT Leon 1.6 16V S 2.23 169 7.59 37 £13,490
Volkswagen Scirocco 1.4 TSI 160PS DSG 2.23 147 6.60 43 £20,410
SEAT Altea 1.6 Emocion S 2.25 173 7.70 37 £14,240
Nissan Note 1.6 Acenta 2.26 149 6.60 43 £12,440
 

Bottom 10 CO2/litre petrol cars

 
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
Toyota Avensis Tourer New 1.8 V-matic T2 2.82 155 5.50 51 £17,585
Volvo V70 2.5T (231PS) R-Design SE 2.77 244 8.80 32 £29,295
Mercedes-Benz E-Class Estate E 350 CGI Avantgarde G-Tronic 2.72 248 9.11 31 £39,719
Peugeot 308 5 Door 1.6 THP GT 136 FAP 2.65 146 5.51 51 £21,945
Peugeot 308 5 Door 1.6 THP Sport 175 2.64 180 6.81 42 £17,995
Mercedes-Benz E-Class Estate E 350 CGI Sport G-Tronic 2.64 248 9.38 30 £40,668
Mazda Mazda RX-8 RX-8 R3 2.60 299 11.48 25 £24,478
Morgan Roadster 3.0 V6 2-seater roadster 2.52 232 9.20 31 £36,641
Mercedes-Benz A-Class Hatchback 5dr A 180 Avantgarde SE Auto 2.52 166 6.60 43 £19,270
Audi Q7 3.6 FSI quattro S Line 2.51 304 12.12 23 £43,135

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