Petrol, also called gasoline, has a freezing range of between -40 and -58 degrees Fahrenheit. The freezing point of gasoline varies because gasoline is composed of numerous different components including hydrocarbons, additives and blending agents that each have different freezing points.
The different hydrocarbons that are found in gasoline can include heptane, isooctane, cyclopentane and ethyl benzene. Heptane and isooctane comprise the largest percentage of the hydrocarbons found in gasoline. Heptane has a freezing point of -131 degrees Fahrenheit and isooctane has a freezing point of -161 degrees Fahrenheit.
Vehicle conditions like frozen gas lines actually refer to the freezing of water molecules and other impurities that are present in gasoline.