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all of that is well said.
o2 can get you there in a lot less weekends but
you need to know where you want to be at and that
my friend is up to you messing with things and
using the o2 sensor to keep it there.

some run down the track in the lower 13s afr

some run down the track in the mid 12s afr

when you are close on my car changing it small
does not make much of a difference worth the messing around.

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Exactly........just like moving the timing 1 or 2 degrees, or changing the tire pressure a 1/2LB, or changing starting line water temp. 5 degrees either way, or raising or lowering the oil pressure 5PSI, or any of the other things mentioned.....doesn't really effect your ET very much......