Just so you all know, 3.55 gears in a 2004 F150 (5.4L) is totally different than comparing it to a Bronco, or even another 2004 F150 with the 4.6L. Gears are chosen to match the motor, transmition and t-case, so unless your comparing identical engines ,drivelines, and even the chasis/body the point is mute.

zman

 

yeah i get way more then 10mpg with my 4.11's in my truck. Probally still around 17-18mpg.