Kg CO2 per litre of diesel

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 diesel cars
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
Jaguar XF Sportbrake 2.0 Diesel Portfolio 163PS RWD Auto 2.09 119 5.70 49.6 £40,200
Jaguar XF Sportbrake 2.0 Diesel Portfolio 163PS RWD 2.11 118 5.60 50.4 £38,450
Vauxhall Insignia Grand Sport 1.6 (136PS) Design Nav Turbo D ecoTEC 2.14 124 5.80 48.7 £20,985
Jaguar XF Sportbrake 3.0 V6 Diesel Portfolio 300PS RWD Auto 2.15 144 6.69 42.2 £49,915
Jaguar XF Sportbrake 3.0 V6 Diesel First Edition 300PS RWD Auto 2.20 154 6.99 40.4 £59,925
Jaguar XF Sportbrake 2.0 Diesel Prestige 180PS RWD Auto 2.22 120 5.41 52.2 £37,205
BMW 7 Series 730d xDrive Sport-Auto 2.24 132 5.90 47.9 £70,325
BMW 2 Series Coupé 225d M Sport Sport-Auto 2.26 124 5.49 51.5 £35,425
Jaguar XF Sportbrake 2.0 Diesel Portfolio 180PS AWD Auto 2.28 132 5.80 48.7 £43,415
Ford All-New Fiesta 3 Door 1.5 TDCi Titanium X 120PS 2.28 107 4.70 60.1 £20,285
Bottom 10 CO2 per litre diesel cars
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
Ford Mondeo Estate 2.0 TDCi ST-Line Edition 180PS AWD Powershift 3.11 165 5.30 53.3 £31,295
Ford Mondeo Vignale Estate 2.0 TDCi 180PS AWD Powershift 3.11 165 5.30 53.3 £33,595
Ford Mondeo 2.0 TDCi ST-Line Edition 180PS AWD Powershift 3.04 161 5.30 53.3 £29,795
Ford Mondeo Vignale 2.0 TDCi 180PS AWD Powershift 3.04 161 5.30 53.3 £32,095
Jeep Wrangler 2.8 CRD Sahara 4dr Auto 2.98 235 7.89 35.8 £38,780
Fiat Doblo XL Combi 1.6 MultiJet 16v L2H2 Active 120HP M1 2.95 171 5.80 48.7 £25,293
BMW 5 Series Saloon 520d SE EfficientDynamics Auto 2.92 114 3.90 72.4 £38,960
BMW 5 Series Touring 525d SE Auto 2.85 134 4.70 60.1 £45,190
Volkswagen Scirocco 2.0 TDI GT 184PS BMT 2.82 124 4.40 64.2 £27,310
Jeep Compass 2.0 MultiJet II 168hp Trailhawk 4WD Auto 2.77 158 5.70 49.6 £35,925