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Thread: Worse Gas Mileage After Spark Plug Change

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04-19-2021, 02:20 PM

repo

Senior Member

Join Date: Sep 2006

Location: Omaha

Posts: 1,252

repo

Senior Member

Join Date: Sep 2006

Location: Omaha

Posts: 1,252

Quote:

Originally Posted by wcjeep

Any chance your computer had learned to deal with bad plugs and now learning to work with new plugs?

Yeah I think if there was old or bad plugs it could have adjusted to run lean due fuel not burning properly so mpg would be "better". And now its still trying to figure out the correct mixture with new plugs which takes some driving to learn.

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