Is 98ron fuel really that much better 95ron

[v8snerlo]

Hi guys,
I have an interesting judgement to share. As you can see from my sig, I have a relatively stock XR8 with the only engine mods being a full exhaust and a KN air filter. Yesterday in Brisbane I had to fuel up but could not find any 98ron Vortex or 98 Ultimate due to the fuel shortage so I had to resort to using 95ron BP fuel. Now I could be imagining things but I feel like I could be waisting money by putting the higher ron fuel in because my car feels like it runs as good if not better on the 95ron. Has anyone experienced the same issue. Now I am judging by the old bummometer as well so don't burn me. If anyone can provide a good explanation then I will be happy. Thanks for reading.
Leon
Ps. Sorry mods if this is in the wrong area but it was pretty general.