I don't know if he ever posted the results, but I will search the
Subie archives.
Bob Parsons kept a little book with him documenting what seemed to be
every trip he ever took in his Westy (with 2.1 VW and 2.2 Subie.) All
the MPG data seemed to be cataloged within. I never looked in it and
read its contents, but he would read from it and, included, would be
things such as elevation, climb, wind speed and direction, etc.

Gracias,
 Miguel