I have 2 friends with nearly identical 2020 F250 4x4 crew cab trucks. The only difference is one has the 7.3, the other has the 6.2. The 6.2 has enough power for what either of them do. But based on what they are telling me there isn't any noticeable difference in fuel mileage. Other than initial cost there doesn't seem to be any real downside to the 7.3. If I needed to haul much weight, I'd go 7.3. For most people diesel doesn't make sense anymore.
