1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Bad Mileage

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Old Nov 23, 2004 | 10:17 AM
  #11  
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are these city/highway combination #* ?
because 24 city is kind of high and 15 combination is way low.
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Old Nov 23, 2004 | 10:19 AM
  #12  
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Originally Posted by Custom88
don't sweat it too much. All of our MPG'* are dropping steadily.. know why? It'* the time of the year. They put out a different blend of gas for winter and gas mileage always goes down significantly. Mine has gone from 28 MPG highway to around 24 MPG. :(
i didnt know that was true or not thanks for clearing that up
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Old Nov 23, 2004 | 11:56 AM
  #13  
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When my MPG dropped, I replaced my PCV valve and I noticed a huge difference.
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