Interesting.
Ive got a 2001 Legacy sedan with minor aero mods and Im getting about 31 mpg at 70 (scangauge).
With the Outback being worse for fuel economy in nearly every way, I guess this really shows that the rear is where the major drag is at.
However I do have a 5spd, I think your 4EAT actually has taller gearing. Do you know what rpms you're at @70? Im at 3200
Anyways well done.