E10 vs E5 petrol: what's the difference?
At the pump you'll see E10 (standard unleaded) and E5 (usually super unleaded). The number is the most renewable ethanol the petrol can contain.
What do E10 and E5 mean?
- E10 contains up to 10% renewable ethanol. It became the standard unleaded petrol in Great Britain in September 2021.
- E5 contains up to 5% ethanol. It's now mostly sold as super unleaded, which has a higher octane rating.
Can my car use E10?
The vast majority of petrol cars on UK roads can use E10, including almost all built since 2011. Some older and classic cars, and some motorbikes and mowers, should stay on E5. Check your car with the government's E10 vehicle checker.
Which is cheaper?
E10 is cheaper per litre than super unleaded at almost every forecourt. Ethanol contains a little less energy than petrol, so E10 can slightly reduce your miles per gallon, but for most drivers the lower price still wins. Compare both on the live map by choosing Unleaded or Super unleaded.
I put E10 in a car that needs E5. What now?
A single tank is unlikely to cause problems in most cars. Fill up with E5 next time. If you're worried, ask your garage or the car's manufacturer.
Questions
What is the difference between E10 and E5 petrol?
E10 contains up to 10% renewable ethanol and is the UK's standard unleaded. E5 contains up to 5% and is mostly sold as higher-octane super unleaded.
Can all cars use E10 petrol?
Most can, including almost all petrol cars built since 2011. Some older and classic vehicles should use E5. Check yours with the government's E10 vehicle checker on GOV.UK.