The wholesale price of diesel was just 6p more than petrol last week (121.06p compared to 115.48p), leaving drivers of diesel vehicles having to pay 168p a litre, compared to just 148p for unleaded.
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The RAC calculates that if diesel was being sold at a fairer rate drivers would be paying no more than around 155p per litre, which would make the cost of filling an average 55-litre family car £7 less than it is today (£85.25, compared to the current £92.40).