Interesting article... As someone who has several older cars, a 67, 87, 89 and 2005... In my "barn" technically it is a large garage, I have a CO monitor as I have to drive my cars in and out of my garage, sometimes I have to let them run to diagnose something. With the 67, With the Large Garage doors open, just starting and letting the car sit for what seems less than 60 seconds I notice that the CO will slowly inch up on the built in digital gauge. However I never see it move with my 87, 89, and especially not my 2016 which you can barely even know it was running based on smell... New cars are really very good for emissions in comparison to what they were 50 years ago.
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