[Stacked6600]

I have a 1995 F350 dually just picked it up ... good oil and all factory nothing but straight pipe. I am getting 7-8 MPG. OUCH> anyone know what i can check to help the fuel milage... Their is no fuel leaks. I have checked and i think the map sensor is on the fritz so replaced it and still CRAPY milage... what else can i check? also has 230000 miles on it. :help

 

[Diesel Dave 04]

injector orings

 

[Stacked6600]

injector orings

if it was Orings would i leak fuel somewhere or just low compression or what? It doesnt smoke runs clean .. Oil looks good. Can you explain how the orings would make bad fuel milage? Thanks in advance.. I have never had this type of problem :usflag