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. The official tests measure exhaust gases only and then calculate the fuel consumption. So these figures show how far off the recording of test results can be due to errors, rounding differences, and the leeway of around 4% given to manufacturers to decide on which fuel consumption figure to use.

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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
Land Rover Discovery 2.0 Si4 S Auto 1.80 223 12.39 22.8 £46,635
Land Rover Range Rover Evoque 2.0 Si4 HSE Dynamic 240hp 4WD Auto 2.11 165 7.80 36.2 £45,415
Vauxhall Crossland X 1.2 Elite 110PS Turbo S/S ecoTEC 2.14 107 5.00 56.5 £19,630
Volkswagen Tiguan 1.4 TSI ACT SE Navigation BMT 150 4MOTION 2.14 148 6.91 40.9 £28,295
Ford EcoSport New 1.0 EcoBoost ST-Line 125PS Auto 2.19 140 6.41 44.1 £22,045
McLaren 570GT 3.8 Twin-Turbo V8 570PS Auto 2.19 258 11.77 24.0 £157,005
Mercedes-Benz C-Class Saloon C 200 SE 9-speed G-Tronic 2.19 123 5.60 50.4 £30,640
Ford Mustang Convertible New 2.3 EcoBoost 290PS 2.19 200 9.11 31.0 £39,535
Ford Mustang Fastback New 2.3 EcoBoost 290PS 2.20 199 9.02 31.3 £36,035
McLaren 540C Coupé 3.8 Twin-Turbo V8 540PS Auto 2.21 258 11.67 24.2 £127,890
Bottom 10 CO2 per litre petrol cars
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
Toyota Auris Touring Sports New 1.2T VVT-i Design 2.63 126 4.80 58.9 £22,310
SEAT Arona New 1.6 TSI XCELLENCE 95PS DSG 2.57 108 4.20 67.3 £23,805
Ford All-New Fiesta 3 Door 1.0T EcoBoost Titanium X 125PS 2.55 107 4.20 67.3 £19,015
Ford Mondeo 1.5L EcoBoost Titanium Edition 165PS Auto 2.53 167 6.60 42.8 £24,895
Morgan Aero 8 4.8 V8 2.52 282 11.21 25.2 £102,075
Skoda Octavia Estate New 2.0 TSI vRS 230PS 2.44 149 6.10 46.3 £26,890
Ford All-New Fiesta 5 Door 1.0T EcoBoost ST-Line 140PS 2.44 117 4.80 58.8 £18,615
Vauxhall Zafira Tourer 1.4i VVT Turbo Tech Line Nav 140PS 2.44 156 6.41 44.1 £21,910
Ford All-New Fiesta 5 Door 1.0T EcoBoost Vignale 140PS 2.41 116 4.80 58.8 £21,315
Mercedes-Benz GLA-Class New GLA 200 WhiteArt Edition DCT 2.41 135 5.60 50.4 £33,500