What GOV.UK says
GOV.UK explains that if your vehicle is compatible with E10 petrol, there is no reason you cannot mix E5 97+ and E10 95+ in the same tank. It also advises drivers with incompatible vehicles to continue using E5 in the super grade.
Why this matters for fuel-price searches
Searches for super unleaded, E5, E10 and 99 RON often mix fuel compatibility with price. That can be risky. The cheapest fuel is only useful if it is the right fuel for your vehicle.
Route & Fuel’s practical approach
Route & Fuel separates E10 petrol, Super unleaded E5 and mapped 97/99 RON labels. The app then lets drivers compare price, route, fuel range and station details instead of treating all petrol searches as the same.
Before you fill up
- Check your fuel flap, handbook or GOV.UK E10 checker.
- If unsure, use the grade your vehicle manufacturer recommends.
- Do not chase a cheaper lower-grade fuel if your car needs premium petrol.
- Compare the route and detour cost before driving to a cheaper station.