Lucid has -- probably inadvertently -- made it easier to see how fast range erodes as speed builds. I say inadvertently, because with UX 2.0 they removed one of the most useful ways of calculating range on the fly when they removed the m/kWh readout. This, of course, highlighted how much less than the EPA range you were actually getting at highway speeds. As an example, our Dream Performance on 21" wheels is EPA rated for 3.9 m/kWh. We've never averaged better than 3.0-3.1 on a highway trip.
What we got instead with the UX 2.0 rollout was a new readout that tells you how many miles of range you will have when you arrive at your destination. It seems to me that remaining range is calculated against the EPA estimated range rather than the battery draw you're actually incurring at highway speeds.
For instance, when I left a charger station on a recent road trip, the readout told me I would have 202 miles of range remaining when I arrived at my destination. Throughout the drive, that figure slowly dropped, and I arrived at the destination with 146 miles of range remaining.