Currently reading: Diesel car cost advantage narrows as fuel prices soar
Long distance drivers have always chosen diesel but lofty pump prices now make petrol an attractive option

For anyone filling up their diesel car this month, the news that 2022 registrations of pure-diesel models fell by almost 40% and mild hybrids by almost 27% will come as little surprise because the financial benefits of opting for diesel over petrol have eroded. 

In the first week of January last year, a litre of diesel cost just 4p more than petrol (£1.49 compared with £1.45). Give or take a few pennies, this difference in their prices had persisted since 2003. Because the typical diesel car is around a third more fuel-efficient than its petrol equivalent, diesel’s modest price premium gave the vehicles an attractive running costs advantage. 

However, shortly after Russia invaded Ukraine last February, this price difference increased by 10p. Fast forward to the first week of 2023 and a litre of diesel cost £1.74 compared with £1.52 for petrol, a difference of 22p.

Petrol diesel

If these prices are maintained, the driver of a new BMW 320d Sport automatic doing 60,000 miles over the next three years will spend £1290 less on fuel than someone driving a 320i Sport automatic. However, at January 2022’s prices, they would have spent £2046 less. Add the fact that the diesel-powered BMW 3 Series is more expensive to buy (£41,870 compared with the 320i at £38,990) and to tax (£1270 compared with £560) and the case for buying a 320d over a 320i has become harder to make now than it was 12 months ago.

The current high price of fuel also continues to attract attention. The RAC has accused retailers of not passing on recent reductions in wholesale costs: a litre of petrol sits at £1.06 and diesel at £1.23. Were they implemented, and allowing for the likes of a 10p-per-litre retailer margin, the RAC says petrol should sit at £1.40 and diesel £1.60. 

However, even at these lower figures, the price difference between the two fuels would still be around 20p, which is 16p more than it was 12 months ago. 

The reason diesel has become so much more expensive than petrol has its origins in the Ukraine war and the UK’s tendency to favour petrol over diesel production, according to Simon Williams, fuel spokesperson at the RAC. 


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“The UK’s refineries are geared towards petrol production,” he said. “As a result, we’ve always imported a lot of diesel. Until last year, our biggest source – supplying one-third of the country’s needs – was Russia. With its invasion of Ukraine in February 2022, our imports of Russian diesel ceased. Now, the UK is reliant on other suppliers and their higher wholesale prices.” 

Fortunately, there is good news for diesel car owners in the form of the vehicles’ rising second-hand prices. Although values of used diesels fell in the immediate aftermath of Russia’s invasion of Ukraine and higher pump prices, consumer demand for the vehicles has remained resilient, according to Dylan Setterfield, head of forecast strategy at Cap HPI. 

The result is that during the past three months, diesel car values have once again outperformed those of petrol cars, in the process recovering more than half the ground they lost between April and August last year. 

“Diesel remains a sensible choice for high-mileage drivers,” said Setterfield. He believes diesel’s resurgence will be sustained by recent and ongoing declines in the registrations of new diesel cars, meaning that what diesel owners lose at the pumps today, they may claw back in the future with strong resale prices in what is likely to become a seller’s market.

Fuel pumps

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Real-world diesel car cost-savings compared with last year

What a diesel car saves in fuel costs compared with its petrol equivalent over three years and 60,000 miles, today and 12 months ago:

BMW 320d sport vs 320i sport: Today £1290 A year ago £2046

Dacia Duster dCi 115 vs Duster TCe 130: Today £1002 A year ago £1776

Volkswagen Golf 2.0 TDI vs Golf 1.5 TSI: Today £1152 A year ago £1812

Bmw 320d 0

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JazminKenna 29 January 2023

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artill 29 January 2023

I have never had diesel by choice (only had a 306 diesel for a couple of years in the mid 90s as a CoCar). And i dont do 20,000 miles a year. So i always buy petrol.

But, however much i dont like them, i wouldnt ban them, i wouldnt ban petrol, or EV either. But i do think they should all co-exist in a world with level taxation. How many would choose a diesel in that sort of world? some, but not many. How many would choose an EV in that world. Less.

They all have their place, and we really should be allowed to choose what we like best, so until we do get banned from what we like i suggest people keep on buying what they prefer.

Tigas 29 January 2023

My next car gone be an Audi A4 TFSI 190 PS with a LPG kit. I think is perfect for me.