I just got back from France and thought that the following might be useful for others going there.
SP98 E5 is generally available in supermarkets and motorway service stations. A bit patchy elsewhere.
SP95 E5 hardly seen anywhere.
Supermarket E Leclerc typically about 1.87 € per litre. I think the cheapest I saw was 1.86 € per litre.
Motorway prices all over the place.
Cheapest and fairly consistent Total 1.99 € per litre
Highest price noted either Agip or Avia, I can’t remember, 2.35 € per litre.
I hope this is useful.
Roger G
Roger Grix