https://www.350z-uk.com/topic/56308-what-can-happen-if-you-run-your-zed-on-95-ron/
I know what I'd rather do. Why buy a £30k car then scrimp on petrol?
Yes they're not that much now, but you don't go buying a 2nd hand Ferrari and get parts from Euro Car Parts. Bit of an extreme example tbh.