That's the 3 tank average, and that first tank was horrible, so it will go up.
Filled up today, first full tank with the "new" engine. 37.4 MPG in mixed driving and numerous cold starts. (wow, this thing sure cools down fast!)
As suspected, the ScanGauge had to be re-adjusted again, but not as much as last time. After the fill-up, it was showing 50 MPG average for a few miles.
No aero mods yet either. I think I'll try a quickie grille block with duct tape this tank, maybe. - for A-B-A testing, at least.