I want to know the best octane booster you can buy at stores. What do they raise 93 oct to??? We were talking about this at work the other day and I don't think anything really raises the octane rating much, maybe to 94 or 95 oct.? Now I know some of you guys are going to say aww you can make your own out of Xylene etc. but I want to know about stuff you can buy over the counter. Please any and all opinions.