Ironically for the past 15+ years the "environmental" legislation in Europe has been heavily promoting diesel vehicles on the (correct) basis that they are better from a greenhouse gas emission/climate change perspective.  Several countries have tax advantages for buying diesel vehicles over petrol ones (in the UK the only advantage is that 1 litre of diesel is taxed equivalently to 1 litre of petrol while diesel has about 15% higher energy density).

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