The question, “why do they use diesel in large vehicles rather than petrol?” is a good question. It is a good question because it implies another question, “why don’t they use petrol in large vehicles rather than diesel?” After all, petrol pollutes less than diesel. Right? Wrong, actually.
Irrelevant factoids cloud the question, “do diesel engines pollute more than petrol engines?” Gasoline engine manufacturers and oil refining companies would like to have you believe so, but it does not. Simply, the answer is, no, diesel engines do not pollute more than petrol engines. In fact,
What Percent of the Thermal Energy Produced by Fossil Fuel Combustion Contributes to the Locomotion of a Vehicle? There is a conundrum with respect to the diesel-versus-gasoline-engine comparison. It is common knowledge in Europe, Asia, Australia, South and Central America — just about everywhere