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
Alfa Romeo Stelvio 2.9 V6 BiTurbo Quadrifoglio 510hp Auto 2.10 189 9.00 31.4 £69,500
Land Rover Range Rover Evoque 2.0 Si4 HSE Dynamic 240hp 4WD Auto 2.11 165 7.80 36.2 £45,415
Volkswagen Tiguan 1.4 TSI ACT SE Navigation BMT 150 4MOTION 2.14 148 6.91 40.9 £28,295
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 £30,635
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
McLaren 570S Coupé 3.8 Twin-Turbo V8 570PS Auto 2.21 258 11.67 24.2 £145,140
Renault Twingo 0.9 TCe 100 GT 2.21 115 5.20 54.3 £14,255
Bottom 10 CO2 per litre petrol cars
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
SEAT Leon 5 Door 2.0 TSI Cupra 300PS Start/Stop 2.68 158 5.90 47.9 £29,915
SEAT Ibiza 1.5 TSI EVO FR 150PS 2.67 112 4.20 67.3 £17,935
Toyota Auris Touring Sports New 1.2T VVT-i Design 2.63 126 4.80 58.9 £22,310
Dacia Duster New 1.2 TCe Nav+ 125hp 4x4 2.62 123 4.70 60.1 £15,095
Dacia Duster New 1.2 TCe Nav+ 125hp 4x2 2.61 115 4.40 64.2 £13,095
SEAT Arona New 1.6 TSI XCELLENCE 95PS DSG 2.57 108 4.20 67.3 £23,805
SEAT Ibiza 1.0 TSI FR 115PS DSG 2.57 108 4.20 67.3 £17,965
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
Vauxhall Zafira Tourer 1.4i VVT Turbo Tech Line Nav 140PS 2.44 156 6.41 44.1 £21,910