my manual for my 90 accord says to use 86 octane. I have my timing advanced 5 degrees, so I use 89 and it works just fine.

 

im just going to use 89, my old no0b habits of 93 and 94 are over.

 

Hey do those octane boosters work? I have an accord with an h22a and 80hp direct port NX. The highest octane here is 91. Are there any octane boosters that work and are safe? 91 seems low for my applications. Thanks