excellent, I coaxed an answer from the expert.
and I hope you werent referring to me with "trying", I never used that word. I've gone through extensive periods of using high octane [for no other reason than that work was paying for it and I wanted to spend as much of their money as possible]. So I can say I've properly "tested" the change and because work was paying for it, I also had to anally log my miles. The result was about 1mpg drop and the totally unscientific, gee the car seems a tiny bit quicker.
I'm all about efficiency and only post this in an effort to more accurately understand the details.
