I've thought of that too.

I'm just going to do what all my boosted idiot friends do.

Mix gas (x) amount of 110 with (x) amount of 87 or...toluene!

Read this:

http://www.toyotanation.com/forum/archive/index.php/t-42491.html

http://performanceolds307.tripod.com/id9.html

I've been researching hard on this lately since i'm almost boosted (and a resident cheap ass). Knock sucks and that octane booster shit you can buy at vatozone cost more than buying 93 octane. You'd need enough of it to raise 87 up till you stop knocking and who knows how much that is..... Stock pistons dont fare well to knock so i know for sure i'm not putting that gimmicky (nos, nx, juice...etc) shit in my car. Until i'm 100% sure i can mix this myself without blowing up a good bit of my neighboorhood, i'll run 93. It's not THAT much more expensive.