Juan, I'm currently testing something else now on the Subaru. I'm not ready to give details yet...but I'll say it's the most exotic far-out thing you never heard of. Easily dismissed as BS.
I can't report MPG gain/losses yet too soon. But the Subie which acts like it has multiple personalities, has so far really evened out. Seems to run happy and consistent.
The how/ what to do w/ this is ridiculously simple and easy. but the "how and why does it work?" well....that's another story for sure. Partly our tax $$ at work from years ago, I think, 10 yrs in development, and the story opens up from there. science fiction stuff.
Tracy G