There is no single freezing temperature for gasoline. Gasoline is made out of different molecules, or hydrocarbons, and these components each have different freezing temperatures.
Unlike many other liquids, gasoline is made up of different molecules that slow down as the temperature drops. If it gets cold enough, gas can become quite hard, and hydrocarbons can crystallize if the gas cools slowly.
The alcohol components of gasoline might freeze first, whereas some hydrocarbons freeze only at extremely low temperatures, below the temperature of dry ice. Because these different elements are mixed together in gasoline, the temperature at which the liquid begins to freeze varies.