so the Honda manual says we should use 91, but where I live there is no 91. all i have available is 87, 89, and 93. i def dont use 87, and due to recent gas prices I have been using 89. any issues with running a slightly lower octane or a slightly higher octane like 93? my car is completely stock.

 

93 will work just fine. Wish I had 93 in Cali! Try and stay away from 87 and 89

 

93 is fine... do not use anything under 91