"Note that when recirculation is on in Teslas, the ambient CO2 concentration in the air spikes to extremely high levels. I used to get headaches on road trips but w/o recirc I do not," the commenter wrote.
"We will look into this and adjust," Musk said yesterday. "In general, I’d recommend against using recirc, as the range advantage is small."
Elon Musk tells customers not to use Tesla's recirculation mode because it spikes carbon dioxide levels in the car cabin.
futurism.com
Hmm... I think I'll prep for a wee bit of a dip.