IMO long range starts at 400+ EPA meanwhile the Lucid air is over 500. But 2.5 hours vs a 303 EPA EV is low. Resistive heaters at 32f can cost you 25% range vs 6% with a heat pump so that could be your issue.

Two tips that may help is preheating your car while still plugged in and doing a partial preconditioning before charging on your road trip. That or your driving habits, speeding has diminishing returns when it costs you range.