ilikeoldfords,
i have an stock auto. not sure if there is anything done to it yet. iam going to open her up when i get home to see if not then ill rebuild with billets. As for fuel mileage i only had comp box for 5 days, i didnt really have a chance to do the math i just notice how the fuel gauge would not move like it did with out the chip. And that on 5x5 wire tapped! I just wanted something to wake it up a bit and it did!