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04 F250 6.0 seeing very poor mpg
Hello everyone let me first off say Im newly registered with this site. But I am very familiar with it as I've been browsing on here for awhile. The search button helped me out tons but its unable to find my problem in here.
So whats happening is on my truck is seeing 11.2 avg mpg calculated by hand. Its a 6.0 completely stock and driven like a old man. No mods have been done to this thing and it has just over 100k. I have replaced the fuel filter with oem replacement, changed the oil, and it seems the air box cleaner is in decent shape still. On average i drive 20 miles to and from the next job site on a day out basis mainly highway. My wheels are stock 16's no lift. The truck runs like its perfect i just know something else has to be going on to make this happen.