Evaporation is the process whereby liquids move into a gaseous state. It is the process that allows saltwater to turn into fresh rain as a part of the water cycle. Gasoline evaporates at different rates based on how refined the gas itself is, the ambient temperature, air pressure, wind speed and the size of the exposed area of gasoline. If you want to make gasoline evaporate faster, change some of these variables. Gas, like all liquids, evaporates faster if provided more heat, more wind, and more exposed area.
Expose a larger surface area of gasoline to the air. This could be done by moving the gas from one container to another that has a larger opening, taking the lid off of an existing container, or opening the doors and windows in an area where gas has been spilled.
Raise the temperature of the gasoline. Move the bucket of gasoline into a sunnier area, open windows and doors --- just keep the gas away from excessive heat and open flames to avoid combustion.
Expose the gas to wind. Put the container out in the wind, put a fan on the container or spill and open the door.
