i know this has been asked before but everyone just states opinions and not any real facts to back up their answers. is it better to use higher octane gas, will my car run better, faster, or longer on higher octane. i have a d15, yes i know it sux, it sux really bad, i went from an ls in a hatch to this and I HATE IT!!! so does anyonne know? or should i just run the lowest and save some money?