Need some tuning help from some of you Professionals.

[LightningGSX]

Originally Posted by CDeutsch

But what if you fuel system is at it's limits? Oxygenated gas causes your fuel system to add more fuel correct? In that case you'd end up running lean, right?

Only by a couple tenths of a point, nothing your ECU can't handle, even if its at its limits.If your car runs better on non oxygenated fuel, its because the oxygenated fuel was shitty to begin with.If both fuels are high quality, oxygenated will be better.