Ok guys so i have created some posts about my truck the latest being a project of replacing the top seals on my injectors. After looking further at my truck the problem I planned to solve by replacing the seals i am confident wouldn't be fixed. about four months ago I purchased a 2005 F-250 6.0 with close to 170000 miles. the truck seems to run great with the exception of an exhaust leak in one of the up pipes and a slight rough start when its very cold but does not last long there seems to be plenty of power no bucking or jerking and no smoke. However, i started to notice that the total miles per tank of fuel have decreased, my MPG is still great. Further investigation has revealed a good amount of is leaking from somewhere. I have heard that it could be o-rings around the fuel pressure regulator or possibly a hole in the fuel lines somewhere. i have the parts for an oil and fuel filter change just haven't done it yet. I am in a holding pattern for driving it for fear of making the issue bigger and causing more damage. if anyone can help please shed some light i hate stressing over my baby.