I hate marketing BS. They didn't just "learn" that the lower grille was more efficient or that an extractor hood releases underhood pressure. Unless GM is just full of completely incompetent engineers, they knew it a long time ago. They make it sound like aerodynamics have never been studied before.
They said the same thing about how the Volt's rear corner creases promote flow separation and then made it sound like the kammback effect was a new discovery that is a sole consequence of the Volt's blessed existence.
Of course that was known long, long ago, but you don't even have to know that... because any monkey can see that the Prius had those shapes before the Volt did.
If they actually did just discover all that then it's
really not something to be bragging about, heh.
Changing the grille textures for better airflow? Yeah, because
that aerodynamic effect makes a
huge difference in cooling this fiery monster.
C'mon Tom, give your engineers some credit. They aren't that dumb, and neither is
everyone else.