why kerosene is not used in automobiles
Answers
I think one of the main issues of kerosene is that it doesn't vaporize quite as readily at low temperatures like gasoline. This means you can have trouble starting your car if the temperature is below that ideal range.
While not used in cars much these, there are a number of small engines like boats and such that do use kerosene as a fuel source. However, they all seem to have the same two-fuel system where the gasoline is used to start the engine, and then once the engine temperature is high enough, it switches to kerosene.
I think the only car company that mass-produced a car that could use kerosene was the Saab 99 back in 1980-ish. Again, it used a gasoline-start and switch to kerosene afterwards. Suffice to say, it makes for a bit more complicated engine, and its creation was prompted by the fuel crisis in the 70's
Kerosene due to its density,
has less lubricity which can result in the multiple wear and tear in the mechanism of automobiles which can burnout and being highly combustible, it might result in serious incidents.