My 2020 F-150 SuperCrew, 5.0 engine, Lariat package shows something like 4,900 pounds curb weight per the manual...but when I put it on the scales it was 5,770. Figuring 400 pounds of passenger weight at the time, and it had only a half tank of gas...I wonder where the ~300 pounds weight difference is? It is still some 700 pounds lighter than the 2010 truck it replaced...amazing.

 

Discussed many times. The manual doesn't include options. The sticker on your doorjamb shows your truck's weight from the factory, and its payload. If you added anything after it was made - floor mats, bedliner, tonneau cover - then it is heavier still and has less payload.

Weigh it full of gas with only the driver to get an exact weight. Subtract that from GVWR to get accurate payload.

 

Minor correction; weight with a full tank, without *any occupants*. Payload is calculated without occupants (not passengers. Occupants.)

This is an interesting thread that collect payloads from a number of users: https://www.f150forum.com/f82/post-your-payload-332538/
My '19 was 5580lbs at the scale, without occupants with a full tank (and 100lbs tonneau). Rated payload is 1535lbs, actual payload is 1470lbs.

 

Sounds about right, my 2015 Screw Lariat was 5,750 last time it was scaled, that was with me in it and a full tank of fuel. Never trust listed curb weights.

 

The goal is to determine payload remaining. Driver is assumed to always be in truck when towing. Plus driver knows his/her weight to subtract it.

 

Manual weight listings assume average options weight, probably an XLT mid grade.
A closer curb weight value for a specific truck is GVWR minus the Load Capacity.
And as always, an actual scale weight is best and most exact as you can get. All else is an intelligent guesstimate.

 

Thread title is "curb weight" and OP is trying to compare to the payload sticker on the door frame. This is all done with no occupants including no driver.

Of course for figuring out how much trailer you can tow within specs, the weight of the driver, and all passengers, and all cargo, and all added mods, everything, all counts. If OP is looking at a towing guide, then the driver is assumed...but driver weight of 150 is probably a bit lower than your average F150 driver in the US lol

 

There's a weight guide to options dealers use to calculate payload. Somebody will post the relevant guide for a 2020 if they have it handy.

 

As previously mentioned, the F150 curb weight does not include the driver or passengers (occupants). All occupants reduce the payload. The F250 and above includes a 150 lb. driver in the curb weight.

 

Actually, OP never mentions the sticker. He's wondering why his scale weight differs from the manual. If OP said he was trying to get match to the sticker, I would have told him to not be in the truck, or to subtract his weight. But he had several people, and a partially full gas tank, and couldn't understand the difference between the scale and the manual.