Yes, octane is calculated differently in North America than Europe.
Regular is usually 87 NA octane, which is equivalent 91-92 RON.
95 RON stated above is around 90-91 of NA octane rating (which is readily common to every (100%) gas station I go to)
98 RON would be about 94 NA octane (which is available to almost every (80%) gas station, what I usually put in my motorbike)
100 RON would be about 97 NA octane (which is rarely available (15% of gas stations)).
Regular is usually 87 NA octane, which is equivalent 91-92 RON.
95 RON stated above is around 90-91 of NA octane rating (which is readily common to every (100%) gas station I go to)
98 RON would be about 94 NA octane (which is available to almost every (80%) gas station, what I usually put in my motorbike)
100 RON would be about 97 NA octane (which is rarely available (15% of gas stations)).