Gasoline Octane Suggestions

Put 1/4 tank of regular and see how it runs if you get destination put in the next higher octane, keep going till you are at the highest octane it will run at.
Keep in mind you should use up the 1/4 tank as much as possible before the next higher grade.

But if you have 1/4 tank of 96 and add 1/4 tank of 98 you effective have around 97.

Some where along the way you can adjust the timming a bit, if need be.

If non alchohal gas is readily available use that.