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I had a similar problem on my S13 a few years ago. Averaged between 270-280 for 13 gallons and plummeted to under 200 miles.
It was a ruptured rubber fuel line that connected the hard line underneath the car to the fuel filter. It would only leak while the car was on. If you're going to replace the rubber fuel lines, you might as well change them all since they will all go bad around the same time. I discovered another pin hole sized leak on another one of the lines.
That alone didn't give me back the lost mileage and the only trouble codes thrown were egr, coolant temperature sensor and knock sensor. Final, the ecu gave an fuel injector code and checking the injectors with an multimeter showed 2 injectors had failed.
If all your injectors are still working, you might have to take out the fuel rail and see if any of the o-rings are leaking.
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