Originally posted by Y2KSVT:
If your pre-cats were clogged, you could have just restored that lost power and efficiency. 19-21mpg is a bit lower than factory, so my guess is that you had bar precatalysts.

Mark



It could have also been low because you did not drive the car much previously so the gas had a chance to degrade over the months the car was sitting. Now that you drive it daily it might help the car run most effieciently. Mine averages 26 MPG city and 29 highway with no A/C. thats with bad cats and a CEL on, plus i don;t drive it softly....