Nothing quite like a technical letter written by a sociology grad eh!.
I was thinking a "form letter response".
Although... it would have been better to have pointed out that no cars sold in NA REQUIRE 100 RON gasoline as they come from the factory.
True and which is 95 in our numbers. I can understand the requirement there with cars operating at 200+ kph and more load on the engine. But there are other conditions that require a higher octane...at least as a safety buffer.
I run an air/oil cooled motorcycle in the Alps that sees its fair share of low speed (minimal cooling - higher cylinder head temperatures), lower RPM while twisting the throttle (loading) to drive out of some very steep hairpins.
The same goes for my air cooled Porsche. I prefer to run a higher octane to play it safe. As it stands, it needs 91 which is the best I can get here.
I must say I have never seen Euro V-power but I did rent a MB A-classe a few years back that only ran properly on Euro-98.
Most Shell stations carry 100. Other brands are Aral Ultimate 100, OMV 100, etc.
The 98 that you bought is known as Super Plus. 95 is their Super which is being phased out slowly.