Wow,
I've never seen a gas tank go off like that before and I've assisted to extinguish more than a few car fires.
It makes me wonder if the gas tank didn't have a bad weld on it as gas tank ruptures are pretty rare.
All the more reason to park your fire engine well back from a burning car.
Just a note about fire extinguishers, every vehicle and home should have one, as John mentioned above, all fires start small, bear in mind that fire extinguishers have a pretty limited output time, measured in seconds, not minutes, any attack on a fire needs to be quick and effective from the start.
