Another ditto. Before I started using 4-strokes I only ran 5% Cool Power. Once I started using 4-strokes, I bumped it up to 10% then 15%.

I still use 15% in the few times that I use a 2-stroke, but only because I don't want to deal with having two different fuels.

If I ran nothing but 2-strokes (God Forbid! ) I would go back to 10%, maybe even 5%