The popularity of diesel is higher than ever, according to new figures.
Sales of diesel in the UK rose by 4% last year, making sales 40% higher than 10 years ago, according to a report by the Energy Institute.
In contrast, petrol sales have fallen 17% in the past 10 years.
The chief factor in the switch is the widespread move to diesel cars by business users, as it returns better mileage and therefore economy despite costing more at the pumps.
Diesel and petrol were last at the same price in June 2007, when they cost 97p per litre. The average UK price is currently 116p a litre for diesel, and 107.4p for petrol.
Diesel prices have since risen more than petrol as a result of demand outstripping supply.
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