I haven't added any additives, What I'm going to do is add a better air-filter & see If I get better MPG.

 

im averageing around 14 hiway and 10 around town

 

Mine is about the same as stud08 - I got 31,000 on mine and has been that since i got it in Nov 07 - I've been a die hard Ford fan since I was knee high to a short grasshopper but somebody hit it on the head with the term 'powerJOKE' when it comes to the 6.4 - that's just my opinion and you know what they say about opinions.............

 

heck my 09 jetta tdi 2700 miles gets 26 city no better

 

I have a 2001, F250. I get 20.3 mpg on the hwy, at 68 mph. I also get 16.0 mpg pulling a 34' Avion camper at 60 mph. Don't know how much in town. I have the big round after market air filter under the hood. Also, straight exhaust. No additives in fuel. Use Castoll Tection Oil. 6 Speed tranny. 7.3 motor. Synthetics in Diff. 268,000 miles on it. If I stay under 2000 RPM, milage is good. When over 2000 rpm. mpg goes down The next thing I want is aux. overdrive, or larger O.D. tires. The manual trans and motor combo is said to be 275 HP out the box. It should not be a problem to handle the overdrive or tires. I use this truck for my Hot Shot buisness, and check the MPG often. I had bad mpg once. No codes came up. But I did change the CPS. (Ford Recall) Brought MPG and Horse Power and torque up. The reason I know the HP and torque went up, was when I got on the highway and floored it, the clutch slipped! It didn't do it before.

 

im getting 13.2ish with the sct performance tune loaded up. but havent really seen highway miles with it just in town. i'll let you know what they do after this week.

 

I have a Job 3 truck, factory standard gearing is still 3.73 - I believe you can get a 3.55 now, but you have to order the truck that way.

3.23 would likely be the way to go.

 

13.8ish and climbing in sct's tow tune

 

5.5 mpg.

-gooseneck trailer.
-25,000 lbs
-stop and go driving


Does this sound right?

 

I was getting 7 or 8 stock with a bumper pull trailer with my rockcrawler on it doing highway driving. I havent reeally looked into what I am getting now though.