Fuel Types & Quality
Petrol vs Diesel
Is diesel or petrol better?
CheckFuelPrices Editorial
Expert Written • 4 industry sources
Neither diesel nor petrol is universally better — it depends entirely on how you drive. High-mileage drivers covering motorway miles typically benefit from diesel's fuel efficiency, while petrol suits city drivers and low-mileage users better on overall cost.
When Diesel Is the Better Choice
Superior fuel economy on long runs:
Diesel engines extract more energy per litre than petrol, so they return better mpg on motorways and A-roads. This advantage shrinks significantly in stop-start urban driving.
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Lower cost per mile at high mileage:
The higher purchase price of a diesel car is typically offset by fuel savings only if you cover 15,000+ miles per year, mostly on faster roads.
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Lower CO2 emissions:
Diesel produces less CO2 per kilometre than equivalent petrol engines, which historically benefited company car drivers on Benefit-in-Kind tax.
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When Petrol Is the Better Choice
Cheaper to buy upfront:
Petrol cars cost less to purchase than their diesel equivalents, and servicing is generally cheaper too. For low-mileage drivers, these savings outweigh any fuel economy difference.
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Better for short and urban journeys:
Diesel engines need to reach operating temperature to work efficiently and to regenerate the diesel particulate filter (DPF). Short trips can clog the DPF, leading to expensive repairs.
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Lower NOx and particulate emissions in cities:
Modern E10 petrol burns cleaner in urban conditions than diesel in terms of nitrogen oxides and particulates — pollutants that affect air quality rather than CO2.
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The Cost of Fuel Itself
Diesel costs more per litre:
Diesel is consistently priced higher at the pump than petrol across UK forecourts. The gap fluctuates but is typically 3–8p per litre.
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Prices vary widely by station:
Whether you drive petrol or diesel, the station you choose can cost or save you more than the petrol-vs-diesel difference. Use CheckFuelPrices to compare live prices near you.
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How to Decide
Use a petrol vs diesel calculator:
Which? offers a free calculator that factors in your annual mileage, journey type, and car price difference to show you the break-even point.
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Consider your future driving:
With more Clean Air Zones and the 2035 new petrol/diesel car ban on the horizon, resale value and running costs of combustion engine cars are worth factoring in.
Check what fuel costs locally:
Once you know which fuel suits you, find the cheapest local station on CheckFuelPrices — updated every 30 minutes from CMA government data.
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Sources
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