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Spark plugs
My cavalier has been having some decline in FE lately so I started giving her a tune up. Once I popped her plugs out I was surprised to see that two of them looked like that had been in her years before I bought her. One was almost burn through. I can not imagine how it was even sparking.
Now the question I have is 2 fold.
How big of an effect on fuel economy does new plugs have? (1-3% is big enough for me)
What would be the best replacement? I was reading about Denso TT plugs and they said they improve FE, but so did a set of Bousch +4's.
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