Alternative Fuels
Bioethanol
What is bio ethanol fuel?
CheckFuelPrices Editorial
Expert Written • 4 industry sources
Bioethanol is a renewable alcohol fuel produced by fermenting plant materials such as sugarcane, wheat, or corn. In the UK, it is blended into standard petrol to reduce net carbon emissions from road transport.
What Bioethanol Is and Where It Comes From
Plant-based alcohol:
Bioethanol is produced by fermenting crops rich in sugar or starch — including sugarcane, wheat, and maize. The resulting alcohol is chemically similar to industrial ethanol.
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A renewable fuel source:
Because the crops absorb CO₂ as they grow, bioethanol produces lower net lifecycle carbon emissions than fossil petrol when burned. It is classified as a biofuel under UK and EU regulations.
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Not the same as home bioethanol:
Bioethanol fireplaces use a similar product, but automotive bioethanol is blended to precise fuel-grade specifications and must meet strict quality standards before sale at the pump.
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How Bioethanol Is Used in UK Petrol
E10 is the UK standard petrol:
Since September 2021, the standard unleaded petrol sold across Great Britain is E10 — petrol blended with up to 10% bioethanol. E10 replaced E5 (5% ethanol) as the default grade.
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E5 remains available as protection grade:
E5 (Super Unleaded, 97+ octane) is still sold at most stations to protect owners of older or classic vehicles not compatible with higher ethanol blends.
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Emissions benefit of the blend:
Switching the UK fleet from E5 to E10 is estimated to reduce CO₂ emissions equivalent to taking 350,000 cars off the road annually, according to the UK Government.
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Is Bioethanol Fuel Right for Your Car?
Most modern cars are compatible:
The vast majority of petrol cars built after 2011 are fully compatible with E10. You can check your vehicle's compatibility on the GOV.UK E10 checker tool.
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Slight MPG reduction:
Ethanol contains less energy per litre than pure petrol, so E10 can reduce fuel economy by around 1–3% compared to E5. This is negligible for most drivers.
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Older vehicles may need E5:
Pre-2002 vehicles, some motorcycles, and classic cars may experience rubber seal degradation or running issues with E10. These vehicles should use E5 Super Unleaded instead.
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Finding the Cheapest Petrol at the Pump
E10 price varies by station:
Even though E10 is the standard grade everywhere, the price per litre varies significantly between supermarkets, branded stations, and independents in the same area.
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Compare live prices near you:
CheckFuelPrices shows live petrol and diesel prices updated every 30 minutes at 4,000+ UK stations, so you can always find the cheapest E10 or E5 locally without an account.
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Sources
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