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The header and over sized exhaust will drop your mileage as the stock exhaust pipe is around 1 1/4", you have a small engine that is tuned to run at low RPM's.
Check that you have the stock transmision, at highway speed you should see the engine spinning at 2,000 RPM or so.
You might also look in to getting stock HF wheels or Civic VX or Civic HX wheels as even the HF steel wheels are narrower and lighter then any other steel Honda wheels.
It sounds like your CRX has spent to much time in the hands of a highschool kid, they might of even done a "mini me" head swap, it's hard to say, figuring out what you have and what is missing needs to be done if you want to see the mileage that your car should be getting.
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