- Plastics: Most plastics, including polyethylene, polypropylene, and polystyrene, have a lower density than gasoline and will therefore float on its surface.

- Wood: Wood has a density that is typically lower than gasoline, so it will also float. However, some types of wood, such as ebony and lignum vitae, are denser and will sink.

- Oils and fats: Oils and fats are less dense than gasoline, so they will float.

- Liquids with a density lower than gasoline: Any liquid that has a lower density than gasoline will also float on its surface.

Objects that sink in gasoline:

- Metals: Metals are generally denser than gasoline, so they will sink.

- Rocks and minerals: Rocks and minerals are generally denser than gasoline, so they will also sink.

- Glass: Glass is denser than gasoline, so it will sink.