In Germany, Shell has a 100 octane petrol available which:
Dank der einzigartigen Formel für Shell V-Power wird das Handling Ihres Fahrzeugs verbessert.that's the first time I've seen petrol's effect on the handling documented....

or is it just buzz...
Anyway, it might be a good thing to download the list of Shell stations to your navigator next time you drive through Germany.