but it sure
doesn't take that long for someone to kill themself that way!

Only in Hollywood. It's not a "big nod" like in the movies.

CO emissions from cars are typically near zero. The CO2 will displace air
and suffocate you. But neither is particularly fast, and survival
instincts are hard to countermand.

3 people died after the Charley storm in exactly this way, two separate
incidents. The gennys were in the garage