I bought this 2011 f250 at the end of Jan. It is a lariat with a 6.2 and 73k miles. When I brought it home I was getting 15.5 mpg. Now the best I can is 12.5. Any suggestions?

Just wanted to say hello to everyone. I own a 2011 F250 Lariat.Joined to find out a couple of things. First of all I am looking for location of the mass air flow sensor. I am putting on a g force chip and cant seem to locate it. I found the air temperature sensor.Second I have the four aux...