Thanks for the great site, have found tons of great info here!
I just bought an 06 F250 XLT CC SB 2WD 99k miles, with a cap on the bed (does that make a fuel economy difference?), and first two tanks I got 14.1 and 14.4 MPG, this last tank I got 11.1 ! (it's been really windy lately) This is just driving the truck, not towing anything except my cheapy 5x8 utility trailer with my sportbike on it for maybe 1/3 of the time for each tank.
I drive 80% highway, and cruise anywhere from 75-82ish, I just set the cruise. I just upgraded from my 01 Expedition with 5.4L. It's current average fuel economy reading for same driving style and area is 13.9 (with 180k miles on it!). One of the big reasons I bought diesel was for better fuel economy than my Expedition, but wow, 1/2 MPG more? My friend just bought an 06 Dodge 3500 diesel CC 2WD 6 speed and he gets 18 City, 23 Highway and about 13 towing a toy hauler through same area. You got to be kidding me
Is it likely there is something wrong with the truck? I still have like 800 miles on the factory warranty, for whatever that's worth. Or perhaps it's just my driving style causing bad fuel economy? The one thing I may get done asap is the diesel induction cleaning, sounds promising from what I've read here. I have no idea how this truck was driven before me, if it was babied is it likely there is tons of carbon buildup causing bad MPG?
The other thing I've noticed since I got it, it has about no off the line performance at all. I punch it at a light and the truck is slow to take off until the turbo spools up. In my expedition the truck will GO when you punch it, is this just the way the F250 is? Please note I'm not punching it all the time, haha.. that would of course cause bad fuel mileage, it's just something I've noticed.