Yeah, just checked my Mk4 manual. I quote:
"Petrol engines
Vehicles with catalytic converter [....]
[use] Premium unloaded petrol RON 95
[....]
The use of unleaded regular petrol with a minimum of 91 RON leads to a slight loss of performance.
[....]
Fuel with a higher octane rating than that require by the engine can be used without limitation. There are however no advantages regarding output and consumption."
Ace! Optimax here I come....
