E10 petrol became the standard grade of unleaded fuel in the UK in 2021 as part of efforts to reduce vehicle emissions and improve environmental sustainability.
While most modern petrol vehicles are compatible with E10 fuel, some older cars and specialist vehicles may still require E5 petrol instead.
If you want more advice around vehicle ownership, fuel types, and maintenance, you can explore the maintenance guidance hub.
What is E10 fuel?
E10 is a petrol blend made up of:
- 90% standard unleaded petrol
- 10% renewable ethanol
The higher ethanol content helps reduce overall carbon emissions compared to older E5 petrol blends.
Ethanol is produced from renewable plant-based materials and is designed to lower reliance on fossil fuels while helping reduce greenhouse gas emissions.
Related reading:
Will my car run on E10 fuel?
Most petrol vehicles manufactured from 2011 onwards are generally compatible with E10 petrol.
However, some older vehicles may not be suitable, including:
- Certain classic cars
- Some early 2000s petrol vehicles
- Older mopeds and motorcycles
- Specific specialist or imported models
Drivers unsure about compatibility should check their owner’s manual or use the official UK vehicle compatibility checker.
If your vehicle is not compatible with E10, E5 premium unleaded fuel remains available at many fuel stations.
What are the different fuel types?
Modern vehicles can use several different fuel and power systems:
Petrol
The most common fuel type for UK passenger vehicles.
Diesel
Traditionally popular for long-distance driving and commercial use, although demand has reduced in recent years.
Biofuels
Renewable fuels designed to lower emissions by blending plant-based materials with conventional fuel.
Electricity
Electric vehicles use rechargeable battery systems and produce zero tailpipe emissions.
Hybrid vehicles
Hybrid and plug-in hybrid vehicles combine electric motors with petrol or diesel engines to improve efficiency.
Does E10 affect fuel economy?
Some drivers may notice a very slight reduction in fuel economy when using E10 petrol compared to E5.
This is because ethanol contains slightly less energy than standard petrol. In most cases, however, the difference is relatively small during normal driving.
Does E10 petrol cost more?
Fuel pricing varies depending on:
- Global fuel markets
- Crude oil prices
- Regional fuel costs
- Supply and demand
E5 premium petrol is often slightly more expensive than standard E10 fuel due to its lower ethanol content and premium positioning.
Does E10 affect engine performance?
E10 petrol is designed to help reduce vehicle emissions and is suitable for most compatible modern petrol engines.
For compatible vehicles, normal day-to-day performance differences are usually minimal.
However, prolonged use of E10 in non-compatible vehicles may lead to issues involving:
- Rubber seals
- Fuel system components
- Corrosion in older fuel systems
What happens if you accidentally use E10 in an incompatible car?
In many cases, accidentally filling a non-compatible vehicle with E10 once is unlikely to cause immediate serious damage.
However, repeated or long-term use may increase the risk of wear or corrosion within older fuel systems.
If this happens:
- Avoid repeated use of E10
- Refill with the correct fuel type when possible
- Monitor for unusual engine behaviour
- Seek professional advice if concerned
Final thoughts
E10 petrol is now widely used across the UK and is compatible with the majority of modern petrol vehicles.
Understanding which fuel your vehicle requires can help protect engine components, improve efficiency, and avoid unnecessary repair costs.
If you’re reviewing your vehicle’s running costs or overall condition, you can also check your car’s estimated value online with our online valuation tool.