Here is all the info on my trip home with fuel mileage. I can honestly say that the predator helped the fuel mileage IMHO.

Mountain driving, Cruise set around 77 MPH
474 miles on tank
32.003 gallons
14.8 MPG

Flat ground, cruise set around 75 MPH
490 Miles on tank
26.905 gallons
18.21 MPG

Flat ground, cruise set around 75 MPH
503 miles on tank
29.98 gallons
16.78 MPG

Some mountains, cruise set around 75 MPH
421 miles on tank
22.2 gallons
18.96 MPG

Total miles driven - 1888
Total fuel - 111.18 Gallons
Average fuel economy - 16.995 MPG
Driving time - ~27 Hrs
Average speed - 69.93 MPH

The truck just rolled over 27k tonight so it is barely getting broken in.

 

You can also look into getting 3.42s to replace the 3.73s...they now offer them for the front 9.25AAM and the rear 11.50AAM...

steved