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Message: [QUOTE="Rich Rohrich, post: 1469036, member: 16241"] Mike - It really depends on what the component makeup of the octane booster is, where in the fuel distillation curve it will exert it's octane effects and what the root cause of the detonation really is. That's a long winded way of saying do a few test passes under load using the octane booster and see how it goes. It's easy to pick up evidence of light detonation on a clean plug. It will look like little black pepper specs on the nose of the porcelain. Of course (and you knew I would get to this) the better long term solution is to get a small quantity of good leaded race fuel and cut that pump swill with it till you have a workable safety margin. If the ethanol was enough to keep the detonation in check then it shouldn't take too high a percentage of real fuel to prop up the pump gas. [/QUOTE]