[QUOTE=bluestratos;897339]I track my fuel by the app "Fuelly", no change due to filter. What I did get was horrendous noise and no horsepower change either, just noise. I ran 0-60 tests before and after so I am confident that it makes no difference. In the days before fuel injection a free flowing air filter made noticeable change as it leaned out the mix a bit. Now with computers monitoring everything, it just blends more fuel in to maintain the same air/fuel mixture.[/QUOTE

I went back to regular unleaded and believe it or not my gas mileage creeped back up, 29.7 this last refill.

what kind of noise are you getting? Do you have the pre-filter.
I have this slight "chirping/whirling/whistle" like noise when I accelerate. It's certainly not horrendous but I noticed it sometimes. It tends to come and go.