Thousands of motorists are wasting money by buying diesel cars, research suggests.
This is because they do not drive enough miles to make them more economic than their cheaper petrol equivalents,
With fuel prices reaching records highs, many drivers are rushing to buy diesel vehicles in an attempt to save money on running costs.
But, analysis by car valuation expert Glass's Guide, shows running a diesel car is only cheaper if you travel at least 10,000 miles per year.
Last year saw record sales of diesels in Britain, as they outstripped petrol cars for the first time.
A total of 981,594 new diesels were sold – nearly 50,000 more than those run on petrol.
However, both new and used diesel vehicles demand a strong price premium when compared to their petrol counterparts.
The average cost of a three-year-old family-sized diesiel can be up to £2,000 more than its petrol equivalent.
Experts said the majority of Britain’s 8,763,500 diesel owners are wasting money.
Adrian Rushmore, Glass's Guide managing editor, said: "Sooner or later, buyers will realise you actually have to do 10,000 miles or so to recoup the cost.
"The 10,000 mile figure is based on averages of hundreds of thousands of car prices and current fuel prices.
"We know the vast majority of private diesel owners in the UK drive less than 10,000 miles a year.”
The average price of diesel last week was 139.73 pence per litre, while unleaded petrol was recorded at 134.81p according to PetrolPrices.com (correct at the time of writing).