I'm new to diesel trucks and I've owned one for 2 months it's a 2007 f250 6.0 with 275's by Goodrich terra grapplers and 12.2 is the highest I've gotten at 65 mph. And I've seen people saying they get 15-19 mpg any help I would appreciate it

 

I had a similar experience - only got 12 - 13 mpg. Then one of my injectors was found to be bad. Replaced it and mpg immediately jumped up to 17-18.

Not to say you have a bad injector but worth running a diagnosis on the health of your motor.

 

Start with cheap simple stuff that will cause a drag. I assume you are calculating mileage by hand, not the onboard display.

If 4X4, make sure front hubs are not locked

Chock wheels, put in neutral, and jack up 1 tire at a time....check for rolling resistance. (could be sticking caliper)

 

I'll try that cause I'm gentle with the peddle

 

I'll do it asap thnx

 

read everything in the read first posts in the 6.0 section. get a scan gage. enter the x code pids and know what they mean. drive the truck and see what you get. check for codes.

wish I had done that before I bought mine. Love my truck but it needs a lot of lovin' and care.

 

Might check in your state chapter to see if there is a member near you that might have an AutoEnginuty with the Ford enhanced bundle. He/she should be able to run a couple of diagnostic tests and check for codes.

Arizona Chapter - Ford Truck Enthusiasts Forums

Might cost you a cheap lunch or couple of cold beverages, but it's allot cheaper than the dealership. It was how I found my last two cracked injectors. As far as 12 mpg; I only get that kind of mileage when I'm dragging the 5th wheel at 70mph in the hills. You've got something going...too bad your 10-12 hours west of me.