I put on the edge cs tuner, and just the k&n filter element.. I put in the towing/performance stage two program then I tweeked some of the shift point settings and leaned it out just a minimal amount, I went from getting 13.5 c/ 15 highway to 16.5 city and 19 highway.
The big thing to check with the tuner is that your rear diff is actually matching what the PCM thinks it is. The factory program says the rear axle was 3.73 when infact I have a 3.55. I also run the 2 inch level kit with 33 inch tires and I set the tire size to properally match as well, which gets my odometer back to being accurate. My best fuel on the highway was an average of 20.5 coming home from Tennessee. The tuner was the best upgrade I ever bought, and I never even put it on level 3 yet..
All these numbers are calculated by the fuel the miles that I drive divided by the fuel I put in. The odometer is very accurate in reference to the actual milage I travel. As I have compared them to gps and google map distances numerous times.
I have a 05 Supercab 5.4 4wd with 33in open country tires and the rancho quick lifts, [email protected]
filter element, new plugs at 100k new fuel injectors at 109 k, and new vct solinoids at 110k.
I currently have 126 on the truck.
Hope this helps!!