what i would do is fill up use 93 octane no additives or any bs and right after u fill up put 1/4 a bottle of rubbing alcohol in the gas tank and it cleans everything ur gas touches.. dont put too much cause ull be shootin flames haha but do not buy any fuel injector cleaner or any of that crap they say helps lol. ull end up payin a lot of money and ull end up clogging ur cat.