Hi all, I am new here, just trying to find some answers, I have 5 ford F250 trucks, we use for plumbing, I just bought a 2008 F250 4X4 Deisel, the best gas milage I am getting is 10 miles per gallon and that only lasted about a day, it just dropped to 7, and the truck has about 3500 miles on it, the dealer says that is normal, my 2005 F250 deisel gets about 17 or so MPG, is there anything I can do to make it better, they say they plugged it into the computer and nothing is wrong, they are fixing a different problem with a short in the trailer wiring, it also runs like crap, they say it is normal and I will get use to it, all my trucks are F250 4X4, some gas , two deisel, any advise would help ! The dealer is not being helpful at all and I am bummed, I love the truck, hate the mpg

 

Did not see the deisel thread sorry !