i just bought a 2004 f250 crew cab diesel 4x4 fx4 6.0 with 60k.
in the highway i get 16.5 mpg and in the city i get 6.9 mpg
the air cleaner look like it was never replaced so i relaced it, is there anything else i should look for

 

I would find out why your getting 6.9 mpg in the city. That does not sound right.

 

I have the exact same truck, but with 70k miles on it.. I probably only get 12mpg city, and 16hwy.

 

Your in town mileage is beyond bad.

I have a 2004 Excursion with 35" tires and do a LOT of idling but still get 11-12 MPG in town. Once the temps get below Zero it goes down to around 9MPG.

I would check for codes and see if there are any stored sounds like you have something going on.

Also your air filter is good till the filter minder says it is bad, those things are built like one for heavy equipment and can take some serious amount of dirt dust and bugs and still flow adequate air.

 

OK i will take it some were to ck for codes, cus this mpg is killing me
i saw the air filter dirty and i replaced it thinking that the filter minder was bad cus it was showing that it was almost new, man i was hoping the air filter was the problem, now my hopes are down again.

 

My 05 Ex averages around 19 MPG city and highway so something is definitely wrong.

 

i have no codes

 

Did you buy this truck as a daily commuter or to use it for work and hauling?

 

i use it for work and daily commute, i dont haul anything.
im an electrician so i go from house to house to suply house, home depot, lowes etc.. i think it was a mistake, all i need is an f150
im selling it for $18,00 or best offer
i flush all fluids, replaced all filters, replaced all 4 ball joints, oil and filter

 

sadly alot of people find this out the hard way. but i can honestly tell you it should be better than that.

have u have egr looked at? my milage went way down when my egr went out. changed fuel filters? any smoke, could be egr valve stuck open?

 

I clean the egr but still the same. Im filling the tank tomorrow and disconecting the egr to see what that does.

 

Was the EGR valve sticky (could be unburnt fuel)? Any exhaust smoke? I would make sure the MAO sensor hose and EBP tube was clear. Might even be worth taking the turbo off and cleaning/inspecting it.

Any gauges? Boost, fuel pressure, and EGT would be handy to have.

If you are serious about tracking it down, you probably need an AutoEnginuity (and even then it may be impossible).
When was the last flash update of all your processors? Since you bought it used, who knows what programs the previous owner was trying to run.

 

A properly running F250 6.0 is going to get better fuel mileage then a F150 5.4 I don't know about the 4.6 engine. The only disadvantage is the extra cost of diesel over gas.

 

Im new to the diesel world.
What is a MAO sensor and EBP?
I can take the turbo off and clean it if that will make a difference.
I have no gauges. The guy told me everything is stock and he has never done anything to it. Is the dealer a good place to take it for a flash update on all the processors or shoud i find a private garage that can do it?

 

Flash at the dealership ($100 - $150).

I mis-typed, it is MAP sensor (not MAO).

I have pics of the MAP and EBP in an album. I will post links in a little bit (or you could search through them). Also, my spreadsheet discusses them - do an Excel search for MAP or EBP.

Edit - link to the album:
https://www.ford-trucks.com/forums/m...p+and+map.html

Also - I asked a question on the EGR valve earlier ...... what did it look like?
Also - Any exhaust smoke?