I have a 17 f150 police responder take home vehicle with the 5.0 I dive 5 days a week for work, it has 3:31 gears, I’m averaging 16 on the highway taking it easy. The truck has no light bar and a factory ford bed cover, in town i average 9 mpg. This isn’t far off from the 7.3.I have a 6.7 Tremor and I’m part of a tremor forum and 2 tremor groups.
They’re better than some other gas 3/4 and 1 tons, but they definitely aren’t that close to a half ton
2020 F150 5.0 is rated around 16/22.7.3 Tremors are probably closer to 11/14.