Kg CO2 per litre of petrol

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 per litre petrol cars
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
Audi A5 Sportback 2.0 TFSI quattro S Line 225PS S Tronic 2.21 159 7.21 39.2 £37,850
Ford Mustang Fastback 5.0 V8 GT 418PS 2.21 299 13.52 20.9 £33,995
Renault Clio GT-Line 1.2 TCe Nav 120 EDC 2.22 120 5.40 52.3 £17,725
BMW 3 Series Touring 318i SE Auto 2.22 129 5.80 48.7 £27,825
Renault Megane Coupé 1.2 TCe 130 GT Line Nav EDC Auto 2.22 129 5.80 48.7 £22,245
Renault Megane Hatch 1.2 TCe 130 GT Line Nav EDC Auto 2.22 129 5.80 48.7 £21,470
Renault Megane Sport Tourer 1.2 TCe 130 GT Line Nav EDC Auto 2.22 129 5.80 48.7 £22,470
Dacia Logan 0.9 TCe Ambiance 90hp 2.23 109 4.90 57.7 £8,595
Dacia Sandero 0.9 TCe Ambiance 90hp 2.23 109 4.90 57.7 £7,595
Renault Megane Coupé 2.0 TCe GT Nav 220 Stop and Start 2.23 167 7.49 37.7 £24,235
Bottom 10 CO2 per litre petrol cars
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
Skoda Octavia Estate 1.2 TSI S 110PS DSG 2.97 113 3.80 74.3 £18,735
Volkswagen Beetle 2.0 TSI Sport 220PS BMT DSG 2.90 157 5.41 52.2 £25,270
Volkswagen CC 1.4 TSI 150PS BMT 2.60 130 5.01 56.4 £25,005
Mercedes-Benz A-Class A 200 Sport DCT 2.59 124 4.80 58.9 £25,035
Mercedes-Benz C-Class Saloon C 200 AMG Line 2.49 132 5.30 53.3 £31,285
Mercedes-Benz C-Class Saloon C 200 AMG Line 7G-Tronic 2.47 131 5.30 53.3 £32,785
Audi A5 Sportback 1.8 TFSI Black Edition Plus 177PS 2.43 148 6.10 46.3 £33,175
Mercedes-Benz C-Class Estate C 200 AMG Line 7G-Tronic 2.42 138 5.70 49.6 £33,985
Abarth 595 1.4 Tjet Custom 140hp Auto 2.42 155 6.41 44.1 £16,225
Abarth 595C 1.4 Tjet Custom 140hp Auto 2.42 155 6.41 44.1 £18,225