Gasoline is a long molecule composed of carbon hydrogen chains (hydrogen atoms and carbon atoms) extracted from crude oil. The hydrocarbon chains that make up gasoline are shorter than those that make up diesel fuel. This is what makes gasoline and diesel fuel different.
Gasoline has a higher ignition point than diesel fuel and thus gasoline engines require spark plugs to ignite the air-fuel mixture. Furthermore, unlike diesel fuel, gasoline generates a flammable air-fuel mixture that is easy to ignite even at low temperatures.

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