The_Duckslayer Posted January 19, 2009 Author Share Posted January 19, 2009 Do you monitor your mileage with every fill up or due you know that at some point you had 18mpg and after you changed the plugs you noticed your economy was 14mpg. Not every tank but every third or so tank. It was around 17.5 before the spark plug change and that was winter gasIt is winter and fuel economy will differ greatly from the summer! Did you check the air pressure in you tires when you changed the oil?Yeah now that you mentioned it they were about 4Lbs low and I have not filled them back up yet but would that make 4 mpg difference? Thanks again././Jimbo Quote Link to comment Share on other sites More sharing options...
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