I do not know if this will be helpful, but as far as I know, these are the only ecomodded Subarus that we have had:
http://ecomodder.com/forum/showthrea...l-14034-8.html
http://ecomodder.com/forum/showthrea...log-26612.html
They gave up, replaced them with a Mini and a Metro, respectively. I am not sure if we have heard much from either of them since.
Brucey had a Subaru, but I do not remember any specifics.
I had a 1999 Forester. It had similar ratings to my Accord, but I only averaged 27 MPG, I tried a few things, but replaced it with my Civic--after replacing the head gasket.
Zerohour did some cool things. I am sure there is plenty of potential to tap in your car!