Fuel Types & Quality
Petrol vs Diesel
What's better petrol or diesel?
CheckFuelPrices Editorial
Expert Written • 4 industry sources
Neither is universally better — it depends on how you drive. Petrol is the smarter choice for most city and low-mileage drivers, while diesel suits high-mileage motorway drivers who can recoup the higher upfront cost through better fuel economy.
When Petrol is the Better Choice
Low annual mileage:
If you drive fewer than 10,000 miles per year, petrol is almost always cheaper overall. The lower purchase price of a petrol car rarely gets offset by diesel's fuel economy savings at low mileage.
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City and short-journey driving:
Diesel engines need regular longer runs to stay healthy. Frequent short trips can cause diesel particulate filter (DPF) blockages, leading to expensive repairs.
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Lower pump price:
Petrol is typically cheaper per litre than diesel at UK forecourts. CheckFuelPrices shows live petrol prices at 4,000+ stations so you can find the cheapest near you.
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When Diesel is the Better Choice
High annual mileage:
Drivers covering 15,000 miles or more per year can benefit from diesel's superior fuel economy, which typically delivers 15–20% more miles per litre than an equivalent petrol engine.
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Motorway and long-distance driving:
Diesel engines are most efficient at sustained higher speeds. Regular motorway driving maximises the economy advantage and keeps the DPF clean.
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Towing and load carrying:
Diesel engines produce more torque at lower revs, making them better suited for towing caravans, trailers, or carrying heavy loads.
Fuel Quality and Cost at the Pump
Both fuels meet UK standards:
All petrol (BS EN 228) and diesel (BS EN 590) sold in the UK must meet the same quality standards regardless of the station brand.
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E10 petrol is now standard:
Standard petrol in the UK is now E10, containing up to 10% ethanol. This slightly reduces fuel economy compared to the older E5 blend, which is worth factoring into your petrol vs diesel comparison.
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Price gap matters:
The difference in pump price between petrol and diesel affects your break-even calculation. Use CheckFuelPrices to see the current petrol and diesel prices at stations near you before deciding which to run.
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How to Make the Right Call
Use a break-even calculator:
Which? offers a petrol vs diesel calculator that factors in your mileage, fuel costs, and car prices to show which fuel type saves you money over time.
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Check live prices near you:
Whichever fuel you choose, the station you fill up at matters. Prices can vary by 10p or more per litre within a few miles — CheckFuelPrices updates every 30 minutes using CMA open data.
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Sources
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