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Fuel economy/greenhouse gases: no difference anymore between Diesel and Otto
Modern gasoline (Otto) engines are as efficient as Diesel engines. According to volkswagen.de, the current VW Golf with a 118 kW TSI (gasoline/Otto) engine gets 139 g/km CO₂ compared to 138 g/km CO₂ for the 103 kW TDI (Diesel) engine, both with DSG.
Perhaps an average price of petrodiesel can be given ? In Europe price is about 1,4 euro and in USA about 0,6 euro/liter. The price of vegetable oil for example is about 0,6 euro in both territories. Link to vegetable oil economy.