LPG and gasoline are two different types of gases. LPG is made up of chemicals such as; propane and butane. Gasoline is refined from oil with chemical additives.
LPG is used for bar-b-que grilles, some vehicles, cooking, heating, etc. It is in actual gas form.
Gasoline is primarily used in combustible engines. Gasoline us not an actual gas. It us a liquid.
We learned in school the different types of matter; solids, liquids and gases. Some scientists also include Plasma, which U.S. used in neon lights.