I tryed some Cam 2 today... put a few gallons in from an empty tank. Its 110 octain. The stuff works VERY well, I went from knock at higher boost (based on meter) to no knock at all with whatever boost I wanted to run. The stuff is $6.70 a gallon here :nono: I have herd there are other stuff you can make your own for cheaper with like paint thinner or somethin strange like that?? IDK, the ocatin booster additive does not have the same effect, its junk, is there any cheaper solution for 110 or higher octain then Cam 2 at $6.70 a gallon?? If so does anyone know the mixture ratio for the additive based on 93 pump gas? I forget what it was but some was talkin about pain thinner or somethin strange like that and u get it for cheap and u can make your own but I dont know the ratio or if thats what the additive was??