During school months i have to drive back and forth to school every week(about 50 miles). I want to get a preditor tuner for my car but if i do any king of tuning then i need to switch to 93 octane gas right? well, if i was to get the tuner and put the custom tune in during the summer with the 93 octane gas and then put the stock tune back in when driving back and forth to school with 87 octane, would that do any damage to the engine when i switch to and from the higher octane gas? thans for the help guys.