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My drive is nose up hill. Shows full when you pull out.... 15 min later about 7 miles shows 3/4. Had to get use to the in my F250 7.3. Not sure if it is the OP problem.You bought a 93k mile 2014, huh? Sounds very familiar. I hope you like working on trucks. Mine did the same thing with something like 180 miles showing and then it dropped to like 80 but it was probably influenced by my driveway and heavy foot. Bad sending unit or wire but as long as the fuel pump works I wouldn't worry about it. I might look at it a little closer next time I drive it. I've never filled mine up since I bought it. I might fill it up in 2025 assuming a miracle happens in November. Post a picture of the truck.