Quote Originally Posted by hydrotinkerer View Post
The truck will readjust fuel trim with map adjuster. O2 adjuster is the way to go.
Most cars will do that. The Eclipse did that.

Using the O2 extenders is the cheaper way but the mpg improvement is minimal. The best results will be from the EFIE.

Ebay's got a EFIE kit for $30 or you can build one yourself... if you can get all the parts for bout $20 plus bout 3 hrs of time (it took me longer than that to build my first one)