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Welcome to EM, and fellow Kansas City area resident...
What engine do you have in the Lumina -- 3.1 or 3.4?
Also, is the Check-engine light on, by chance? If so, I would diagnose anything that would cause it to run inefficiently, and see if inexpensive fixes are available. Mid 25's are OK -- but if it's the 3.1 averages tend to be a bit higher.
I would look into that first -- great bargain for 30K miles of driving though!
Best FE to ya!
RH77
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“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein
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