Fuel octane vs concistancy

[Adger Smith]

Consistency has a lot more to do with the Lean/rich of the tune than the octane.
Get her to lean and the air goes up a couple of numbers she falls off. Get it too rich and the air goes down and she slows up because she is way too rich. There is a sweat spot in the tune. It is usually a "Window" and that is what you need to find at your track, the conditions you run in. The oxygenated fuels seem to have a little larger "Window".