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
Peugeot 308 5 Door PureTech 1.2 e-THP Allure 130 EAT6 S&S 2.15 112 5.20 54.3 £21,830
Peugeot 308 SW PureTech 1.2 e-THP Allure 130 EAT6 S&S 2.15 112 5.20 54.3 £22,765
Peugeot 308 5 Door PureTech 1.2 e-THP Active 130 EAT6 S&S 2.16 106 4.90 57.6 £20,630
Peugeot 308 SW PureTech 1.2 e-THP Active 130 EAT6 S&S 2.16 106 4.90 57.6 £21,565
Smart fortwo cabrio 1.0 passion 71hp start/stop 2.16 93 4.30 65.7 £13,265
Infiniti Q50 3.0T Sport 411PS Auto 2.20 206 9.38 30.1 £41,070
Renault Clio 0.9 TCe Dynamique Nav 90 ECO 2.20 97 4.40 64.2 £14,925
Ford Mustang Fastback 5.0 V8 GT 418PS 2.21 299 13.52 20.9 £35,745
Renault Clio GT-Line 1.2 TCe Nav 120 EDC 2.22 120 5.40 52.3 £17,725
Renault Clio New 1.2 TCe Dynamique Nav 120 Auto 2.22 120 5.40 52.3 £16,965
Bottom 10 CO2 per litre petrol cars
Make Model Derivative CO2 (kg)/litre CO2 (gpkm) Litre per 100km MPG (combined) List price
Volkswagen Beetle 2.0 TSI Sport 220PS BMT DSG 2.90 157 5.41 52.2 £25,540
Volkswagen Beetle Cabriolet New 1.2 TSI Dune 105PS BMT 2.69 129 4.80 58.9 £24,565
Volkswagen Caddy Life 1.4 TSI 125PS BMT 2.65 135 5.10 55.4 £20,319
Volkswagen Caddy Maxi Life 1.4 TSI 125PS BMT 2.65 135 5.10 55.4 £22,049
Volkswagen Caddy Life 1.4 TSI 125PS BMT DSG 2.63 129 4.90 57.6 £21,912
Volkswagen Caddy Life 1.2 TSI 84PS BMT 2.61 120 4.60 61.4 £19,165
Volkswagen Caddy Maxi Life 1.4 TSI 125PS BMT DSG 2.61 120 4.60 61.4 £23,617
Mercedes-Benz C-Class Coupé C 200 AMG Line 2.49 132 5.30 53.3 £33,210
Mercedes-Benz C-Class Saloon C 200 AMG Line 2.49 132 5.30 53.3 £31,915
Mercedes-Benz C-Class Saloon C 200 AMG Line 7G-Tronic 2.47 131 5.30 53.3 £33,415