I’ve a 2000 model Johnson 115hp V4 Oceanpro (2nd owner). I have run 95 in this motor since I’ve had it and the original owner told me that he ran 95 in it since new. Neither him nor I have had any fuel related issues using this fuel. I can also say that since I’ve had the motor I have only used BP fuel, as I don’t go looking for somewhere to save a cent or two.
The Evinrude site says use 87 or 89 octane fuel, but the USA fuel rating are taken from AKI which is the average of RON & MON indexes. Now getting technical, but the American 89 octane is, I think somewhere between Australian 95 & 91. So once again it’s your choice
Use what you want but find one that you are happy with and stick to it. Same goes for oil, find a TC-W3 rated brand that you believe works for you and stick with it.
It really is a personal choice and what works for and is readily available to you
Good Luck