Here's why:

* Chemical elements are the simplest pure substances that cannot be broken down further by chemical means. Examples include carbon (C), hydrogen (H), oxygen (O).

* Chemical compounds are formed when two or more different elements combine chemically in a fixed ratio.

Gasoline is a mixture of hydrocarbons, primarily alkanes with carbon chain lengths of 4 to 12. This means it's made up of the elements carbon and hydrogen bonded together in different combinations.