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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
SEAT Leon 5 Door 1.4 TSI FR 150PS ACT 2.10 109 5.20 54.3 £20,000
Peugeot 208 3 Door 1.6 THP XY 156 2.11 135 6.41 44.1 £17,950
SEAT Leon ST 1.4 TSI FR 150PS 2.11 112 5.30 53.3 £20,995
BMW 2 Series Coupé M235i Auto 2.17 176 8.09 34.9 £35,805
BMW 2 Series Coupé 220i M Sport Auto 2.20 139 6.31 44.8 £28,930
Peugeot 308 CC 1.6 THP Roland Garros 156 2.22 160 7.21 39.2 £26,510
Peugeot 308 5 Door 1.6 THP Allure 156 2.22 129 5.80 48.7 £20,150
Morgan 4/4 1.6 2.23 143 6.41 44.1 £33,080
Ford Focus Estate 1.0T Titanium X Navigator EcoBoost 125PS 2.24 114 5.10 55.4 £23,495
Citroen DS3 1.6i VTi 16V DStyle by Benefit 120hp 2.24 132 5.90 47.9 £16,800
 

Bottom 10 CO2/litre petrol cars

 
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
Skoda Rapid Spaceback 1.2 TSI Elegance 105PS GreenTech 2.95 118 4.00 70.6 £16,890
Subaru Forester 2.0i XT CVT 2.85 197 6.91 40.9 £30,995
Ford Grand C-MAX 1.6T Duratec Titanium Ecoboost 150PS Start/Stop 2.62 149 5.70 49.6 £22,250
Toyota Yaris 1.33 VVT-i Excel 5-door 2.61 119 4.56 62.0 £15,695
Citroen C3 Picasso 1.6 VTi Exclusive 120hp 2.48 149 6.00 47.1 £17,095
Maserati GranTurismo 4.7 V8 Sport MC Shift 2.48 385 15.52 18.2 £94,140
Mercedes-Benz SLK-Class Roadster SLK 250 AMG Sport 2.45 169 6.91 40.9 £38,705
Mercedes-Benz B-Class B 180 Sport 2.44 144 5.90 47.9 £23,335
Mercedes-Benz A-Class A 180 Sport DCT 2.43 124 5.10 55.4 £23,290
BMW 1 Series 3 Door 116i M Sport 2.43 131 5.40 52.3 £22,470