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What's your instrumentation & driving strategy? I only have a vacuum gauge, and I'm committed to cruising at 15 in.Hg these days. Sometimes I go slow, if there's a headwind, and sometimes I go fast if there's a tailwind.
Aero will buy you more speed, but if you drive with load you can still get great mileage, just at a slower speed.
If you really want better aero, look into a partial kamm-back on the hatch. It shouldn't interfere with access.
Also, that 4psi you're giving up on the tires is low-hanging fruit. Tire "blowouts" from excess pressure are a thing of the past, 50-80 years past.
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