So, around here, the left corner of Europe:
98 Octane = 1.25€
95 Octane = have no idea! :)
Diesel (yep... we use that thing!) = 0,96€
These are the lowest prices, per liter, in supermarket pumps. Branded fuel, like Galp, Repsol, etc., is usually 0,06€ (6 cents) more...