well to clean out my fuel system, i all ready put 93 octane in my car all the time, so i jsut throw a gallon of denatured alcohol in there..boost the octane rating up to 106..and cleans out the enitre fuel system also lol..i just haven't done it in along time...need to but it's gonna be awhile since my DL's are suusspended and i've got no job...