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Thanks for your feedback everyone! FYI the main reason I changed them was due to poor idling and lower fuel economy then when I bought the car new. I put NGK Ruthenium plugs in and I’ve gained about 8MPG
Are you saying that you gained 8.0 mpg (not 0.8) just by changing plugs?
That's amazing!
Why isn't Ford using these plugs and more importantly why am I not using them!
 
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