175 miles a day on weekdays then hauls cows, hay or tractors on the weekend. pushing 290k miles and gets 19 mpg (or better) if i keep it under 70 on the highway.
i'm getting better mileage than that out of my '01 f250 with almost 300k miles on it. my '15 ram with a semi does better too. toyotas run forever but they are terrible on fuel.
there are still some 7.3's out there in good shape but the prices are going up instead of down. i daily drive my '01 plus haul a few cows with it now and then. my much newer gas burner just sits.