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Yeah, it all depends. I would think if they're as bad as you say, you should notice a difference. Maybe not much in FE but likely in driveability which that alone can be worth it.
I've tried specialty plugs and they've all been a waste and in one instance it was a detriment. NGK coppers have always worked great for me in my foreign cars.
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1992 Geo Metro, 1.0L 5spd, 435,000 miles on the original engine and trans!
- knuckles/hubs/brakes/13" wheels from a 2000 Metro
- running 175 70R13
- averaging 51.7 MPG, 56.9MPG best tank.
- self built MPGuino
- http://www.dschmidt.com/MPGuinoJBD.html
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