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E10 vs E5 petrol explained

What the ethanol content means, compatibility with older cars, and whether the economy penalty is worth worrying about.

5 min read · Written by Sam Richards · Last reviewed 2026-08-17

Key takeaways

E10 is standard unleaded and contains up to 10% ethanol; E5 survives mainly as super unleaded with up to 5%.
Virtually every petrol car built since 2011 is E10 compatible; some pre-2002 cars are not.
E10 gives roughly 1-2% worse fuel economy, far less than the price gap to super unleaded.

What the numbers mean

The E number is the maximum percentage of bioethanol blended into the petrol. E10 has been the standard 95-octane grade in Great Britain since September 2021; E5 continues to be sold as the more expensive super unleaded grade.

Ethanol carries less energy per litre than petrol, so a higher blend gives slightly fewer miles per tank. The effect is small — commonly quoted at around 1% — and is normally swamped by driving style, tyre pressures and load.

Compatibility

All petrol cars registered from 2011 onwards are approved for E10, and most from the early 2000s are too. Classic cars, some mopeds and a small number of models built before 2002 can suffer damage to fuel lines and seals from higher ethanol content.

The government maintains an online E10 compatibility checker by make and model; if your car is on the incompatible list, super unleaded E5 remains available at most larger forecourts.

Is E5 super unleaded worth the money?

For an E10-compatible car, no on economy grounds. Super unleaded typically costs 10-20p per litre more, which dwarfs a 1-2% consumption difference.

The argument for super unleaded is octane rating rather than ethanol content: a small number of high-performance engines are tuned for 97 or 99 RON and will make more power and run more efficiently on it. For ordinary engines, the manufacturer's recommended grade is the right one.

Frequently asked questions

Can my car use E10 petrol?

Almost certainly if it was registered from 2011 onwards. Some cars built before 2002 and many classics are not compatible — check the government E10 compatibility tool for your make and model.

Does E10 reduce fuel economy?

Slightly. Expect roughly 1-2% fewer miles per tank compared with E5, which is normally less than the variation caused by driving style or a cold engine.

Is super unleaded better for my engine?

Only if your engine is designed for higher octane fuel. For a standard car it produces no measurable benefit and costs substantially more per litre.

Prices come from the UK Government's Competition and Markets Authority (CMA) open fuel price scheme and refresh throughout the day. Figures older than seven days are excluded.