18.5 MPG? Barely 17??
If only I could get that! I am running those Bosch 4s as well. I can get 15 mpg with 93 octane with the wind at my back and traveling down hill (coasting). I am lucky to get 13 mpg.
Seriously, I have not had any problems with those plugs. I also did not notice enough change in performance (improvement) to purchase then again. I am running 8.5mm Taylor Wires as well. Maybe you should think about new wires. Dont worry about spending an arm and leg for OEMs... any hot rod shop should carry a good 8mm or 8.5mm that is universal. You will have to cut it to the correct length but not a difficult task. Just do one wire at a time so you dont get them mixed up.
If it makes you feel any better, I am still jealous of that 17 miles per gallon.
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