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Not sure this is worth anything to the thread, but I have two Celica ST's w/4A-FE's. My combined city/highway and summer/winter mileage, since I've had them, is 27.0 for one and 28.5 for the other (difference being in how driven, one by a daughter and one by a son, and guess which got the worse mileage!!!!).
On both, there were times when the mileage exceeded 35, over 40 a few times, but more times was under 25, sometimes under 20.
One really shouldn't make a judgement on mileage from one tank of fuel, because of so many different factors. But an average trend chart would do very good.
Recognize also that many states primarily have a 90:10 blend of ethanol mixed in fuels now, and the total heat from the ethanol fuel blend is about 94-95% that of the 100% non-ethanol based fuels. You might have that going on, taking on some part of the problem.
Cleaning an O2 sensor rarely makes it work better - it may just be old and giving too lean of readings to the ECU, and your fuel trims are too high now. Your ECT (engine coolant temperature) sensor may no longer be in the calibration range, so its telling the ECU that the engine is colder than it really is, causing high fuel trims.
I suggest you get an OBD-I Toyota plug compatible scanner and check your long-term and short-term fuel trims. If the long term fuel trim is way up there in positive territory, then you know your ECU is putting far more fuel to the engine for some reason. You can read what the ECT sensor is telling the ECU also, to see if that sensor is faulty. You really can't read data from the O2 sensor, but if it has more than 100,000 miles on it, that would be a highly suspect part to be considered at fault for your fuel mileage.
Last edited by 93celicaconv; 06-18-2010 at 05:59 PM.
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