Why is gasoline so flameable?

Question

Why is gasoline so flameable?

Answer 1

The same thing that makes it work in engines.

It's molecules combine readily with oxygen, releasing substantial heat.  That makes more molecules combine with oxygen faster.  It's volatile (has a low boiling point).  Vapors ignite easier than liquids, more surface area to mix with air.

Answer 2

The structure of its atoms and molecules. That is what causes all chemical properties for all substances.