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'90 LX 5.0 Poor Mileage, Ox Sensor?
My old girl used to get over 300 miles per tank, has been for years (I've had the car since 1990 when I bought it). Over the last few months I noticed that I'm only getting about 260-280 miles per tank using the same gas and driving the same route each day (I use it mainly for going to and from work; most of which is interstate).
A buddy of mine suggested that the cause might be the Oxygen sensors. I checked tire pressure and the air filter, both are good. How can I test the Oxygen sensors? What else could I check?
Thanks.
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-1990 Mustang LX 5.0L 5-Speed All Stock!  except the stereo...
-2005 Yamaha V-Star 1100 Custom 
-2008 Toyota 4Runner Ltd 4.7L AWD 
-2019 Subaru Ascent (the wife's) 
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