Hmmm, my matter of thinking was to LOWER my nitro content as the engine ages/breaks-in. I would think the higher nitro would be required more for a new engine than one that has been broken-in and tuned to the nth degree...

I have a Saito and TT four strokes that I run Mach 7 fuel in (15%) and as they got older hoped I would be abole to run 10% in both. I have about 4 tanks on the Saito and I already have a reliable idle at 2500 or so...

Someone tell me if I am going about this all wrong.