No i dident know all the tech about octain,yes just about the compression ratio and or timing changes for some motors work better than others on wood gas, i know chris saenz said you can go up too 17 too one compression at max before spark knocking, so i then i wood suppose its over 100 octain maybe about?I think race motors run about 12 or 15 too one compression and use aviation fuel , 100 plus octain?