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Just had to make that cheeky edit. It's true, but it's not the only reason.Kevin B wrote:By comparison diesel oil has a higher calorific value than petrol which is part of the reason why a diesel car will be more economical than a comparable petrol engine car.
.. and in actual fact, it's only true if you're considering calorific value per unit volume. If you compare calorific value per unit mass, the figures for petrol and Diesel are somewhat more similar, as Diesel is somewhat more dense than petrol.
Vegetable oil has the same issues again. It's slightly more dense than mineral Diesel fuel, and has a lower calorific value per unit mass than Diesel fuel. If I remember correctly, Diesel fuel can be anywhere between 42Mj/Kg and 44Mj/Kg, whereas Veg oil is around 37Mj/Kg.
But of course you can get more Kg's of Veg oil in your tank than you can Diesel fuel.
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