Gasoline burns at 495 degrees Fahrenheit at standard atmospheric pressure. This ignition temperature is the lowest temperature at which gasoline may undergo combustion. If the temperature is lower than this, a fire is needed to ignite gasoline. If too little air is present, a higher temperature is needed.
Gasoline does not burn when it remains in liquid form. The ignition temperature is required to first cause it to turn into a vapor, after which mixes with air and ignites by exchanging outer electrons with the oxygen present. Gasoline can be turned into a vapor at a much lower temperature, called the flash-point, but it does not burn without a source of ignition.