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Sorry for asking about fuel mileage. Kind of a dumb thing to ask:o. One last question. Is it safe to stay on the 93 tune with 91 octane in the tank or vice versa? please don't panic, I have not done this, I am just trying to understand tuning a little better. Thanks again guys!

Hello. This is my first post. I recently bout an 04 with an SCT torrie tune. It came pre loaded with the tunes "93 tune", "91 tune" , "race tune" and of course factory setting. Is it as simple as applying the tune to the gas you are using? What is the difference between the 93 and 91 tune? Which...