[aerohead]

I've never seen any technical data for the RIVIAN, other than it's Curb Weight.
I could guestimate its frontal area.
They don't publish a drag coefficient so far.
Inverter efficiency ditto.
Motor efficiency ditto.
I'll leave charging efficiency for a different examination ( no one speaks of well-to-wheel efficiency of ICE vehicles ).
A single-speed trans would be approx, 98% mechanical efficiency.
If we knew it's aero, we could reverse-engineer its rolling resistance from its Wh/mile consumption, at, say, 100-km/hour.
Then we'd have its road load.
Then we could reverse-engineer its brake-horsepower -e.
So far, it's like we're expected to buy a home without knowing its square footage, or whether it has any insulation in the floor, walls, or ceiling.
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For CYBERTRUCK we'd need it's actual:
Cd
Frontal area @ 8-inch ground clearance, with mirrors
EPA test weight
Inverter efficiency
Whether it has the 'RAVEN' motor or not
It's transmission will be 98% efficient
Actual Wh/ mi at a given velocity
If it came in at Cd 0.31,Tesla's shape would give CYBERTRUCK a distinct advantage over all the other EV pickups on the HWY. Something which appears to escape many auto journalist, when they refer to it as a 'science fiction movie prop.'
AeroStealth owned an F-150 Brett Herndon 'Cybertruck' in 2014, and after conducting road tests in West Texas, I can tell you firsthand that, there's not another EV pickup that will be able to touch Tesla on the highway. Love it, or hate it, 'shape' IS the secret sauce.