the alcohol will eat up the rubber in your fuel system....including hoses and rings...

if anything, by zxylene or toluene...you can find it at taylor's do it center..but i forgot what the stuff is called. it's pretty similiar sounding to the name...i think it's called zylol. the stuff actually works if you put enough ni with your gas to really bump the octane up. i've used it a couple times. the car runs smoother and pulls harder up top. its like 3 bux for a quart though, and you need to add a few quarts a tank if you want to bring the octane lvl up.