Question about 1999 Buick Century

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I have a 1999 Buick Century with 168,xxx miles on it. I used to get 25-28 miles to the gallon but in the last year its gone down to about 21 mpg. The check engine light was on and when checked it was the massive air flow sensors. I replaced that this month but my MPG hasn't improved. I have new tires that were put on in December as well as an alignment. March of last year I changed the fuel filter, spark plugs, and wires. In July I put in a new fuel pressure regulator. Any ideas on what might be causing this?

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  • kristinaspid Feb 11, 2012

    I bought the car about a year and a half ago, as far as I'm aware the speed limits haven't changed.....

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