As fuel costs continue to rise, the price difference between diesel and petrol is widening.
On average, filling up with diesel will cost you at least 7p a litre more than unleaded.
That's the biggest the gap has been in three years.
It could also hit drivers who swapped petrol for diesel in an effort to save money.
Jane Whittle of ACF Car Finance answers questions on whether switching to diesel is still a cheaper option.
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