tank mileage issues

[allstarlawncare]

I have a 2004 f250 extended cab powerstroke and I have been getting terrible gas mileage. When I fill the tank full the reading never says it will last more than 270 miles until empty. I usually fill up when I have 210 miles on the tank and put in about 21 gallons so thats only 10 mpg. this is around town mileage and i feel like it should be much greater. I know a few guys with the same truck and they pull a 8000# trailer and get 14mpg.

What can be done?

[allstarlawncare]

nobody has anything out there? I dont get more than 220 miles to a tank and i know that this should not be. Plenty of guys i know get the same mileage with their gas trucks if not better. looking for any help i can get

[fuzzman]

Mileage can vary by a pretty large margin. Here are some things to consider:
2wd or 4x4
What's your gearing
Are you running loaded or unloaded
How's your truck running?
FICM problems?
E brake sticking?
How faithful have you been on maintenance (oil, filters, fluids etc.)
You running big tires with a lift?

All these things (and more) can have an impact.

Also, did you get better mileage and then start getting worse?
Did you ever get baseline engine load and compare to now?

Some trucks are just pigs audits hard to explain why, while some need maintenance. Need more info to be helpful.

[allstarlawncare]

it is a 4x4 and everything on the truck is stock except for tires, but the tires are the same size as stock. not sure what the gearing is and this is also not pulling any load. Pulling load it drops down 1 or 2 more mpg. i bought the truck last january and it has been the same ever since. It is significantly worse when plowing snow

[Qholic]

I would look into getting a tuner. I was getting about 12.4 MPG combined and with various tunes I now average about 15+ around town and up to 17 MPG on the highway; not bad for a F350 Dually.