why is my mileage horrible?

[Goose350]

4x4? If so are your hubs locked? Does the truck miss while cruising down the road? Fresh oil? New fuel filters? All these can lead to bad mpg. Those tires aren't helping either.

[scso]

hubs are unlocked, all fuel and oil filters just changed, i ran a tank of the diesel kleen stuff, couldnt tell any difference, just bought some standyne. the motor runs smoothly however it seems ultra-loud from the engine compartment, i assumed it was because of the k&n intake and filter? is there supposed to be a hood liner? also it turns over a lot before it cranks which is starting to worry me, the batteries are the originals, im gonna put 2 optimas in and see if faster turning will build pressure quicker. maybe its just a great looking lemon...

[superxcrewfx4]

I saw 16 going down to north carolina doing 70 on the highways, i thought it was a little low but idk, the truck runs great. I dont get below 11 around town whereas my f150 gets like 9 around town and 14 on long trips.

[Tony V]

I think you might just get ur truck checked out and if everything checks out maybe try a tuner.

[roadrunner]

just got my 07 back a couple of weeks ago, had moderate fuel in oil (4%) after uoa, had o-rings leaking on injectors. thats the only issue with this one @ 80,000 mi., the absolute worst i ever got mpg wise is 13.5 brand new, now i get consistently 18-19.9, i would have dealer check out ficm, icp & non-stock size tires kill mpg

[scso]

how do i know how much fuel is in the oil? what is uoa? can they tell if an injector is going bad just by plugging into the computer?

[roadrunner]

uoa, used oil anaylsis, and yes there is a cylinder contribution test among others via computer to check injectors