Fuel Types & Quality
E5 vs E10
Is E5 petrol better than E10?
CheckFuelPrices Editorial
Expert Written • 4 industry sources
E5 is not universally better than E10 — it depends on your car and what you value. E5 delivers marginally better fuel economy and is essential for older or incompatible vehicles, but E10 is the greener, lower-carbon standard fuel now sold at most UK forecourts.
What's the Difference Between E5 and E10?
Ethanol content:
E5 contains up to 5% ethanol blended with petrol, while E10 contains up to 10% ethanol. Both must meet the same British Standard for base fuel quality.
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E10 is now the standard:
E10 became the default petrol grade at UK forecourts in September 2021, replacing E5 as the standard 95 RON pump grade.
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E5 is still available:
E5 remains available as the premium 97+ RON grade (labelled 'Super Unleaded') at most larger forecourts, specifically to protect drivers of incompatible vehicles.
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Where E5 Has an Advantage
Slightly better fuel economy:
Ethanol contains less energy per litre than petrol, so E10 can reduce fuel economy by around 1–3% compared to E5 — most drivers won't notice, but it is measurable.
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Safer for older and classic cars:
Around 700,000 pre-2002 vehicles are not compatible with E10; for these cars E5 is essential, as higher ethanol content can degrade rubber seals, plastics, and metal fuel system components.
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Better for stored or seasonal vehicles:
Ethanol absorbs moisture, so E5 is preferable for vehicles that sit unused for long periods, such as classic cars, motorcycles, and seasonal vehicles.
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Where E10 Has an Advantage
Lower carbon emissions:
E10's higher ethanol content reduces CO2 emissions by around 2% compared to E5, which is why the government mandated it as the standard grade.
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Compatible with most modern cars:
All petrol cars built from 2011 onwards are E10 compatible, and the vast majority of vehicles made after 2000 are also approved by their manufacturer.
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Cheaper at the pump:
Because E10 is the standard grade, it is typically a few pence per litre cheaper than E5 Super Unleaded at the same station.
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Which Should You Use?
Check compatibility first:
Use the government's E10 compatibility checker at gov.uk to confirm whether your vehicle is approved for E10 before switching.
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Most drivers should stick to E10:
If your car is compatible, E10 is the practical choice — it's greener, cheaper, and widely available. The small economy difference rarely offsets the price premium of E5.
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Compare prices before filling:
E5 Super Unleaded prices vary significantly between stations. CheckFuelPrices shows live prices at 4,000+ UK forecourts so you can find the cheapest E5 near you if you need it.
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Sources
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