+1
I would just say that if you use 95 ron (especially on a uk car) you wont definitely suffer from pinking. Seems nissan list 95+ being ok. Its not poison for your engine. However, if you push the engine regularly getting it very hot, especially in an import that is mapped for higher rons, it would be a good idea to user a higher octane fuel. The 350s are not to my knowledge any more suceptable to pinking than other sports cars.
Been driving a Imported Toyota Celica Gt4 St205 (selling it now if ur interested!! ) for the past 4 years and you know the difference. The imports are ecu mapped from 95-101 RON as japan 's fuel is 100 RON. The Uk variety are ok for 95-98 RON but put out 240BHP instead of the 255 stock import.
Its a well known fact that many GT4 members have lost engines to detonation... essentially the engine when running very hot (which is typical of a car running 13+psi boost as standard) risks detonating the air fuel mixture on compression instead of when the spacrk is ingited.
Obviously if the cycle of the piston is not in the correct position when the mix detonates then the piston is force back against the normal rotation and you hear 'pinking' as the piston fights momentum of the rest of the engine. This nirmally results in cracked piston heads, rings etc...
The higher the RON value, the more stable the fuel. So a 100 RON fuel with a higher octane rating will be much less likely to detonate due to heat (or in some cases running lean)
FYI
Pinking sounds like a gnome stuck in ur engine with a little hammer trying to get out.
Unleaded 95 Ron
Super Unleaded 97 Ron
BP 97 Ron
V-Power 99 Ron
Tescos 99 Ron
My personal advice from experience? You can go the whole hog and add fuel additives to achieve 100 Ron... but to be honest you are best running your car on the minimum requirement unless you can tell the difference of using a higher octane fuel. 97 super unleaded is fine if the manufacturer has mapped the car to run on it.
If you are concerned by the longevity of your engine then treat it to an oil change, let the oil warm up properly before running the engine hard, and cool down slowly by not redlining it to your front door then turning it off for the night. These things will add 1000's more miles to your engines life than any choice of fancy fuels.