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2002 7.3L power stroke ford F-250 and i get about 20mpg
I've gonna call BS. Or post your mods and indicate if you run larger tires and whether or not you've had your speedo recalibrated.
Every crew cab 4x4 auto 7.3 I've ever had (99 and 03) have both gotten 12-14mpg in town and 18mpg max on the highway. They were in stock form with 285/75 tires.
It all depends on how you drive it. I can make mine get 8mpg if I want to. But typically in mixed driving I get 17. On my way to work this morning I noticed it was at 17.1.