What's the reason to pay more expensive fuel than needed?
I think Audi for DZ engine had specified 95E. Higher octane rating than manufacturer had specified means that u can increase compression and/or boost, if u haven't done anything of that, it's just waste of money
Btw in estonia one guy owns Toyota Supra with 1k bhp which is daily car and which runs on 95E - at last some years ago it was like that, maybe now there has something changed.