Salutations, fellow gas savers

[Whitetoy]

I just purchased a salvage-title fixer-upper 91 Civic HB .
The plan is to fix it up and get as good a mpg as I can.
The body and interior are rough, but the drive train is
pretty good. It passed smog, and I got 35 and 34 mpg in
the first 2 tank fulls, so I'm happy already.
Hoping to get over 40 eventually, even though I'm stuck with California-formulated gas.

Any suggestions for improvement for this particular
model? Its a DX, so it has DPFI.