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I think that the article could be better written. We're pretty much running the same gas in Europe and North America, in general. The author says Europe has higher octane - yes, but that's because it's measured differently. Europe posts the RON (Research Octane Number), while North America posts AKI (R+M)/2 (Anti-Knock Index [RON+MON]/2).
98 RON = 93 AKI
95 RON = 91 AKI
91 RON = 87 AKI
So in the last paragraph, there is no actual difference in actuality. The GM engineer doesn't state which method is used in mentioning 114 octane (likely RON, I would guess). I run 93 AKI in my Porsches.
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-Chris
2004 Porsche Boxster 2.7
1991 Porsche 911 C2 Targa 3.6
2017 Subaru Outback 3.6R
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