It's been a while, but we've been slowly progressing.
Beleaguered by some organizational problems and empty assurances of the Scangauge company (the computer we had been trying to use to determine MPG), we've decided to move forward with our basic experience-based MPG calculation of 16 MPG. After getting her a full tune up, we cranked Ewvee's front down and placed blocks in the rear to drop the whole car's body a few inches. The question now is whether to get taller wheels/tires in order to have the engine work less (at the expense of a higher ride height) or to get shorter wheels/tires in order to lower the height even more drastically, lessening the frictional air that sneaks beneath into the under carriage. Stay tuned.
