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600 miles per week wow! I dont even want to think how much in fuel you have to spend each month. I hope you can write it off.
My dads '02 F250 7.3 automatic, 2wd gets high teens on average. He just came from an 800 mile road trip-mostly interstate, and said he got 23 mpg on the way up. Hes got a hard tonneau cover and I forget rear gear ratio but I think its 3.73. He tows a bass boat and enclosed motorcycle trailer regularly and he said on the interstate he gets about 14-15 pulling them on average. He has aftermarket exhaust and a chip that gave him an extra 50-60 lb/ft tq over stock.
On the flip side, my brother has two 7.3s in his landscape truck fleet and he is always complaining what fuel hogs they are. But they are driven mostly in town, lots of stop and go, pulling trailers and hauling heavy stuff. He's gotten as low as 6-7 mpg he figures at the worst.
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