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I don't know a lot about emissions technology. I do know there are all sorts of issues around enrichment of a cold engine just for driveability. My Previa does not switch into overdrive until the coolant is up to operating temp. This is just so it does not "lug" under power in the high gear with low engine speed and a cold intake.
It's possible in the Prius that the "cold enrichment past converter warmup" is just a drivability compromise so that if you floor it it will not stumble and that it has nothing to do with emissions. In fact it's possible that the coolant temp hack even reduces emissions.
Logically that makes some sense as an overly rich mixture spews unburned HCs. The converter deals with that.
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Vortex generators are old tech. My new and improved vortex alternators are unstoppable.
"It’s easy to explain how rockets work but explaining the aerodynamics of a wing takes a rocket scientist.
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