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Honestly it sounds like a leaking injector. I have yet to see an o2 sensor cause that type of fuel consumption,but if your not having serious driveability/power loss issues which you would with the above mentioned possibilities i would honestly say you have a bad fuel level sending unit. Break out a multi-meter and do a resistance check on the sending unit circuit and that will tell you if your sending unit is faulty. That or you will see some sort of physical obstruction with the float. Plus i get close to 300 miles to the tank with my SR and thats with an untuned AEM. Check your timimg, check your oil to see if you have excessive gas mixed in there, check the condition of your spark plugs. Id be willing to bet its a combination of several things causing your excessive gas consumption.
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