Re: octane boost
With the 10.2:1 I think I was mixing it 3:1 or thereabouts...with our current 12.2:1 it gets straight race fuel. We could probably mix it a tad now, though, as we only have 34 degrees total timing in it, but I'm erring on the safe side.
We usually have a drum of purple around, though, so I'd use that versus the actual additive out of a can...the stuff in the can turned the plugs colors, making them tough to read.
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