Per octane grade
Most gasoline (for automotive use) sold in Ireland is RON 95, labeled E5, corresponding to gasoline blended with 5% v/v ethanol. Some forecourts also supply a second grade of (higher octane) unleaded gasoline, which may be branded as ‘super unleaded,’ which also contains ethanol at 5% v/v but octane is higher, e.g. RON 97 E5 is sold at stations in Ireland.