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If you guys are worried about Carbon Monoxide inside your cabin then buy a unit designed for a small aircraft cabin. They make devices with a spot in the center that turns dark when exposed to carbon monoxide and they last a year for $4. I used them in my Cessna for years just to be safe.
Here is a link to an aircraft parts supplier who sells a variety of different types of Carbon Monoxide testers: https://www.aircraftspruce.com/menus...detectors.html
I used the $4 dollar version in my Cessna 172 for years and never had any issues. Cheap and effective insurance...