I think that depends on what your plans are. I wanted to make sure I can ALWAYS be able to buy fuel so I went pretty conservative(mine runs fine on 89, found that out by an oops )If your plans are always being able to run race gas or premium fuel(or any type of combo)you can be more aggressive. I have no idea what pump swill will be in the years to come, so I stayed conservative.
)If your plans are always being able to run race gas or premium fuel(or any type of combo)you can be more aggressive. I have no idea what pump swill will be in the years to come, so I stayed conservative. 
