John,I did use a genuine tetraethyl lead additive that worked,but it's quite expensive.This detonation problem with my engine is a result of the way it's built and tuned.It's right on the edge and a slight drop in octance has it detonating badly.The water -alcohol injection works for me,it's primary purpose is to limit detonation.There's no real advantage to it if you engine doesn't have a detonation issue.
