Quote Originally Posted by Tig View Post
MPG went south HARD....I'm happy with everything it did, but the AF ratio/timing needs to be tuned a little, or whatever is causing it
From what I have seen, the MPG doesn't look bad on the DIC because they play with the Injector Flow Rates. So while your MPG may look the same on your dash, figure it by hand and you will notice the decrease in MPG.

So to the OP, figure a few tanks of gas by hand (the correct way) and compare these to your MPG before the PCM. I am interested.