Octane Question

[eclipsemf]

I have read about all the forums related to octane and I'm still a bit confused about it all. I have been running my car on 87 octane for a while and just realized I should be running on 91 The only problem is my gas station only carries 89 or 93. So my questions are should I run the 89 or the 93 octane and is it ok to fill it up with a bit of 87 still in the tank. Thanks for the clarification. My car is on stock boost with just minor bolt ons that are listed in my profile.



Mods please move this if needed, was not sure if this is where I should post it or not.

 

[4Lurker4]

Run 93, the way the fuel maps are done is in reference to higher octane gas to avoid the possibility of knock (higher octane, less chances of knock) Check the cluster "premium fuel only" should be written there.

 

[eclipsemf]

Alright thanks for the quick response! I will start running 93 octane in her! I saw the "premium fuel only" I just seemed to space that one , thanks again