[aerohead]

I tracked down Wouter Remmerie online.He's the creator of AirShaper.com virtual wind tunnel.At his website,you can find his analysis of Cybertruck which he describes as a ' quick and dirty analysis based on a public 3D model.'
Some comments on the model:
*actual forebody side elevation curvature is absent.
*Actual aft-body upper curvature is absent.
*Actual 5-facet plan-view camber and boat-tailing is absent.
*Potential in-operation body ground clearance,or inclination (rake) cannot be known ahead of time.
Also,zero-yaw,or SAE,crosswind averaged coefficient of aerodynamic drag is not addressed.
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Comments:
Any prediction of Cd 0.48 would be predicated upon vortex drag.From the vortex research of Ahmed,Baumert,Bearman,Davis,Howell,Hucho,Janssen,J ones,and Morel,it would be problematic to generate Cd 0.48 from a prismatic fastback model,given the particular architecture of Cybertruck.
From the Ahmed body,it's been demonstrated that vortex drag cannot be supported given consideration of diffuser angle, boat-tailing,and chamfer,all features incorporated into Cybertruck,especially with its active air-suspension.Tumblehome,also a feature of Cybertruck,is not considered at all in the prismatic model studies,and tumblehome is critical to drag optimization of the fastback form.
Oddly enough, the Ahmed body achieves its lowest drag with an identical Cybertruck backlight angle.Volkswagen also found it to be true for their Gen-I Golf/Rabbit.
Had these subtle features been incorporated into the CFD analysis,I suspect that the numbers generated,would take on an entirely different appearance.

Wind tunnel investigations of Nuccio Bertone concept car bodies of the late 60s,early 70s reveal zero forebody separation or edge vorticity with forms remarkably similar to Cybertruck.