Few year back i was a member of an ireland Nissan group manly for sourcing Pulsar VZR bits, another car ideally meant to run on super unleaded with no major issues being run on 95ron. Didnt come across any horror stories regarding the 350z either, only issue with the little 1600cc was that most cars didnt make book figure for bhp and tbf it was the same in the uk.
Not for a second saying to use 95ron all the while, which i never have but i dont think its the be all and end all if you get caught out.