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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
Koenigsegg CC 4.7 CCX V8 2.16 368 17.02 16.6 £718,296
Vauxhall Agila 1.2i 16v VVT S 86PS (a/c) Auto 2.18 131 6.00 47.1 £12,335
Infiniti G37 Convertible G37 GT Auto 2.21 264 11.92 23.7 £40,335
Renault Clio 3 Door 1.2 TCe Dynamique TomTom 100 2.22 129 5.80 48.7 £13,600
Renault Clio 5 Door 1.2 TCe 16V 20th Special Edition 100 2.22 129 5.80 48.7 £14,950
Renault Clio Sport Tourer 1.2 TCe 16V Expression 100 2.22 129 5.80 48.7 £13,275
Vauxhall Insignia Saloon 2.0i Turbo SE 2.24 197 8.80 32.1 £24,565
Ferrari 458 Italia 4.5L V8 458 Italia 2.24 307 13.71 20.6 £169,546
Volkswagen Caddy Maxi 2.0 EcoFuel 109PS Life 2.24 157 7.01 40.3 £18,033
Maserati GranTurismo 4.2 V8 Automatic 2.24 330 14.71 19.2 £80,450
 

Bottom 10 CO2/litre petrol cars

 
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
Mazda Mazda RX-8 RX-8 R3 2.60 299 11.48 24.6 £25,540
Mercedes-Benz A-Class Hatchback 5dr A 180 Avantgarde SE Auto 2.52 166 6.60 42.8 £20,000
Vauxhall Corsa 5-door 1.4 Exclusiv 100PS Auto 2.51 138 5.50 51.4 £13,975
Volkswagen Tiguan 1.4 TSI Match 4MOTION 150PS 2.50 185 7.39 38.2 £22,845
Chevrolet Captiva 2.4 LS 5-Seat 2.50 217 8.69 32.5 £19,145
Ferrari 599 GTO 5.5L V12 599 GTO 2.47 411 16.62 17.0 £285,053
Mercedes-Benz C-Class Saloon C 250 CGI BlueEFFICIENCY Sport Auto 2.47 178 7.21 39.2 £30,915
Mercedes-Benz C-Class Saloon C 180 CGI BlueEFFICIENCY Sport Auto 2.46 172 6.99 40.4 £28,475
Mercedes-Benz A-Class Hatchback 5dr A 160 Avantgarde SE Auto 2.45 162 6.60 42.8 £18,615
Hyundai i30 1.6 Comfort 2.45 152 6.19 45.6 £14,100

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