I was getting just under 7 when I was going 67 mph, and I decided what the hell, as long as the mileage sucks I'll go 75! Then the mileage went up to 7.2. I know it's because the POS automatic won't unlock the TC at those speeds because it will redline.

I need some tranny work. This will be worse when I put on the 305's next week!

 

9.8 with 6in lift and 22" on 37" toyo mud tire with edge chip

 

This may be way out in left field, but have you tried having your computer reflashed? That thing should stay locked up at a lot slower speeds than that. Just an option, I would try or at least look into. Something is definately not right.

 

in the summer I get 22 to 23 @ 65 MPH and 18 in town. In the winter the i lose about 2 mpg. These are hand calculated numbers & I have kept track of ALL fuel the truck has consumed, so there is no fill up error. I have posted graphs of my mpg before, PM me if interested.

 

I was getting 15.5 city/hwy combo, then I got the reflash done for White smoke/MPG and am now getting 20MPG hand calc. Very glad I had it done.

 

Have you had the 'Hard Start' and other mods TSB (18-003-06 REV. A) done? My buddy just got his '06 2500 up-dated and it really helped his mileage and power.

 

Funny how on a Dodge you get a flash/TSB done & milage & power goes up, but on a Ford only the noise goes up while milage & power go down .