I don't remember who told me to watch for my gas mileage to drop off after I installed my Bosch plugs , But they where right ! Plugs only lasted about 6 months, then mileage dropped down, Then engine recently started to miss !.
Installed new NGK TR55'* this Sunday, Running much better now !!
Wish I'd known about the Bosch plugs before I installed them !
Thanks !

There'* a good handful or two of us that have achieved our all-time best MPG'* with the TR55'*. Great plugs.

This story is repeated over and over with the bosch plugs, including me.
Seems our cars like conventional plugs better.

Yes, it does seem that way. And this is exactly why:

http://www.bonnevilleclub.com/forum/...=article&k=103

http://search.yahoo.com/search;_ylt=...t-501&ei=UTF-8

Glad to see you made the switch to TR55'*. I will be doing the same in about a week, I have AC Delco plugs in now but I want to see if I can gain anything.

Kevin, if you recall, we ALL told you so at CEBF

Glad you've seen the error of your ways

my 01 had platinum plugs orginally when i got it and the previous owner complained it was only getting 24MPG..with a set of autolites it was around 29 on the highway before I started modding it.