do you need to run race fuel? if you car will run on 87, race or e85 fuel will do nothing for your motor. You may pick up a very few hp because you can advance your timing a little more but its not worth it. I am assuming you have a naturally asperated motor and unless your compression is around
12:1 there is no need for e85 or race gas. the only reason the flex fuel cars are around is because alcohol burns cleaner and is better for the air. e85 is 85% ethenol 15% gasoline