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
Kia Stonic New 1.6 CRDi 2 108hp ISG 2.18 109 5.00 56.5 £17,795
BMW 7 Series 730d xDrive Auto 2.24 132 5.90 47.9 £67,940
Renault Trafic Passenger SL29 ENERGY dCi 145 Sport SWB 9-seat 2.37 152 6.41 44.1 £34,311
Fiat Fiorino Combi 1.3 MultiJet Crew 80HP 2.45 115 4.70 60.1 £17,123
Kia pro_cee'd 1.6 CRDi 2 DCT ISG 2.45 103 4.20 67.3 £20,635
Hyundai i40 Saloon 1.7 CRDi Premium 141PS Blue Drive DCT 2.46 123 5.00 56.5 £28,235
Hyundai i40 Tourer 1.7 CRDi Premium 141PS Blue Drive DCT 2.46 123 5.00 56.5 £29,585
Peugeot 308 SW New 1.6L BlueHDi Active 120 EAT6 S&S 2.47 99 4.00 70.6 £22,490
Kia Carens 1.7 CRDi 2 114hp ISG 2.48 109 4.40 64.2 £22,180
Mercedes-Benz C-Class Saloon C 220 d SE 7-speed G-Tronic 2.48 109 4.40 64.2 £33,125
Bottom 10 CO2 per litre diesel cars
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
Jeep Wrangler 2.8 CRD Night Eagle 2dr Auto 2.98 235 7.89 35.8 £39,810
Mercedes-Benz E-Class Saloon E 220 d AMG Line 9-speed G-Tronic 2.87 112 3.90 72.4 £40,015
Volvo V90 2.0 D5 AWD PowerPulse Cross Country 235HP Geartronic 2.83 139 4.90 57.6 £44,705
Volkswagen Scirocco 2.0 TDI GT 184PS BMT 2.82 124 4.40 64.2 £27,265
Ford All-New Fiesta 3 Door 1.5 TDCi B&O PLAY Titanium Series 120PS 2.78 89 3.20 88.3 £19,075
Ford All-New Fiesta 5 Door 1.5 TDCi B&O PLAY Titanium Series 120PS 2.78 89 3.20 88.3 £19,725
Volvo V40 2.0 D2 Cross Country 120HP Geartronic 2.78 104 3.75 75.4 £26,280
Jeep Compass 2.0 MultiJet II 168hp Trailhawk 4WD Auto 2.77 158 5.70 49.6 £35,595
Mercedes-Benz Vito Tourer 114 CDI PRO Extra Long 2.76 171 6.19 45.6 £33,303
BMW 7 Series 730d Exclusive Sport-Auto 2.76 124 4.50 62.8 £67,035