In Germany V-power is 100 octane, but I always preferred Aral 100 as it was just...better. Whilst a bit cheaper too. Recently Aral have started rating it at 102 RON. Sounds about right from experience if the Shell is 100. And the 102 is still cheaper than V-power.100+ insane! Who'd have thought the French would get the best octane fuel...
So I always go for Aral in Germany, its the best quality stuff out there. There is a pump near the Nordschleife too.