I actually that 50/50 is flammable but takes serious heat to ignite it, once nearly vaporized in a hard hit spraying all over the interior, which certainly could happen, even if it does not ignite it is quite toxic and with air bags going off, metal shearing, etc....I just had a really strong feeling come upon me, some call it intuition, that is was not safe for our two doggies, my wonderful wife and I to have it mounted in the hatch of the car out in the open.
Maybe it has something to do with being in AZ the last 6 months, Scottsdale the last 4, aggressive drivers always speeding, many on their phones, run red lights all the time, illegal uturns, tail gaiters, pulling out in front of you, turning around on freeway ramps, I saw 6 accidents in an hour one day, two quite serious.