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A rear-end collision, a spark from dropping a can while taking it from the roof - lots of bad possibilities there. Never fill the can until just before heading off-pavement, and do not drive for any distance on roads shared by other vehicles.


A bit alarmist, if you will permit me. A full fuel tank is much safer than one that is, say, 2/3's or less full. Liquid gasoline doesn't burn, at least not at "normal" temperatures. It is gasoline vapor which is so (very) flammable. Very few car crashes, even those where the fuel tank is ruptured, result in a post crash fire. Use an approved container, store it outside the passenger compartment and be careful, not fearful.