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Poor mpg indicators.
I didn't read all the prior responses, but i would recommend checking on your o2 sensor to ensure that they are creating the proper voltage from heat exchange. Generally, this would give you an error code if they failed or went out of range, but not always. The o2 issues would also give you secondary indicator problems...such as poor excelleration, hesitation at times and possibly rpm surging during normal driving.
Also, check to see if your running ethenal/gasoline at your local gas station - this will generally cause you to lose approx. 10 - 15% mpg.
Here in the northwest, they run this additive 1/2 the year at most gas stations. (Generally during the winter months). Major decrease in mileage is always noticed.
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