Yes, it is right. In US is 91 AKI same as 95 RON in Europe.
I calculated and figured this numbers for different reason. In Europe is recommended and only supported fuel for 370Z - 98 RON gasoline. But some gas stations sells 95 as 98 RON, so in my previous car used 95 instead 98 without issues. But them were second hand a Z is brand new and beloved.
Don't know if is 93 AKI rare or just unusual fuel, I use 95.
Here is nice article:
Octane rating - Wikipedia, the free encyclopedia
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