This is proportional, though a bit lower, to what many of us see with the Air. I have a Pure with 19 inch Aeros. Without the covers on the wheels I get about 350 miles of highway range on my 420 mile EPA rated car. It’s a fine result. I get more room, more power, and similar efficiency to a Tesla Model 3.
But Lucid went all in on an efficiency claim people never see in the real world. Marketing pushes companies to this sort of thing, but over the long term, I think Lucid would have had a lot less post purchase disappointment to deal with if they had gone Porsche’s route and underpromised and overdelivered on range.