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sorry if this is the wrong area for this thread but i have a prob. the best mpg i was getting was 27 on a long trip but usually only about 24mpg on trip and about 20 (if lucky) in the city. i have 63 k on my car and just changed my 02 sensor to see if it would help. its worse now. im getting 16-17mpg and am taking it easy going to work. any comments? no scans have been done. and im still on the first tank of gas. please help
 

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What brand of sensor did you replace it with? Bosch or AC Delco?
 

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I thought AC Delco's O2's are BOSCH or the same or very similar to BOSCH. I have a DENSO Lead resistant O2 Sensor.
 
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