Really, how often are there fires in automobiles cause by electricity? Dont fusible links and fuses protect them from that? The most common cause of fire ive seen is from fuel related items such as injectors, cracked or loose fuel hoses, or overflowing carbs, etc. Heck, we all know what the best chemical for fuel related fires is, right? Foam, like they use on jet airplanes.......jk
So what im saying, is that a Class A B canister would be just perfect for automobile usage.