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After the tune-up items, also look to see how much the o2 sensor is to replace. After a certain number of miles, the precision of the sensor decreases, and mpg slowly gets worse and worse.
If it is a standard narrow-band sensor, it should be about $70 for a plug-in, and $35 for a wire-in.
If it hasnt been replaced ever, probably a good time to do it. (And I'm referring to the one near the engine, not the secondary o2.)
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