I did not say no one dies of CO poisoning in their car. And, yes, it happens occasional when people that get caught in a snowstorm when people run the engine to keep warm, AND the car has an exhaust leak that vents into the car, which almost never happens.
Again, far and away, most non-suicide CO poisoning deaths in the US result from poorly installed gas appliances and portable heaters. Insurance companies often mandate smoke alarms be installed.