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As the title says i am wondering which is the better option? I'm very new to tuning so i'm learning as i go with the help of the webinars and courses on here. I have an n/a drag car running 14:1 cr the car is mapped already on 102 octane elf fuel but i want to change fuel with the hope of getting a few more bhp am i better off using e85 or 116 octane elf?
