My car is fully broken in with 12k miles. Those of you who are still getting 16-18 mpg, it WILL improve w/ miles. I easily got 22mpg w/ a heavy foot. With a Diablo tune I got a couple more.
I lost 3-4 mpg when I disabled AFM. Now I have it set up (HP Tuners) where AFM is only active in Drive - 5th and 6th gear only. In Manual it's totally off.
Best of both worlds that way..
