Me I seemed to get better performance adn MPG with anything higher than what I was tuned for 93. Talked to my tuner today he said if he did a 93 tune would advance my timing, get more HP, and may even get better MPG, but need to always use 93 or higher, so I told him since not going track, I'll keep 87 for now, cuz I don't do bamtunes, my guy charges me 150 $ for a new tune, so I'll stay at 87 for now.