I'm with old bald guy(and I also fit that profile).I'm a fireman for a a fair sized city,and while car fires are common,I remember one death,and that was a bum living in a van.Seen quite a few deaths from accidents,none from fires afterward myself.

But most of our car fires are arson,And one in four responses? That sounds way off.Most depts run 40-80 percent ems.If you remove ems it still doesn't sound right.My city runs over 30,000 runs a year,we don't have 7,500 cars fires...My company runs 3,000 plus a year and we don't have 750 car fires more like 50.

Personally,I don't carry one,in fact I don't know anyone who does.I do leave my cars parked outside of the garage though,because I don't care if my car burns,but believe me you don't want it to happen inside your garage.