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    jkocmich's Avatar
    jkocmich Posts: 3, Reputation: 1
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    #1

    Nov 8, 2008, 02:31 PM
    02 jetta 2.0 mpg gowing down
    I changed the spark plugs in my jetta and now I get 23 miles to the galloon compared to 27 with the old ones. They are the oem plugs but I didn't check the gap. Would a wrong gap cause that much of a drop in mpg?
    wrenchone's Avatar
    wrenchone Posts: 1, Reputation: 2
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    #2

    Nov 13, 2008, 07:54 PM

    Yes, wrong gap will cause inadequate spark which won't burn all the fuel in the cylinder, thus less power and less fuel economy.
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