i want a tuner for my 2001 5.4L F-150, i want one mainly for better MPG, and to change tire size calibration... i want to run it on 87 octane, iam mainly looking for better MPG u would say, and change the tire sizes????

 

The only one I can speak for is the predator. The tune it will give you requires 93 octane, however the users manual has a way to customize the tune to so you can run on 87 octane by backing off the timing. It will calibrate tires as well. Haven't had it for long enough to speak for mpg gains though.

 

We have a similar thread in the 4.6/5.4 forum, if you want to check into that.

-Kerry