Answer
The warm mixture of air and gasoline on top of an open gasoline will most likely settle down
instead of rising in a cooler environment.
Work Step by Step
The atomic mass of fuel or petroleum is 114kg/kmol (C8H18),which is bigger than the sub-atomic mass of air (29 kg/kmol.).Therefore, even though the temperature of gasoline vapours is higher,the vapours will in any case settle down as it is heavier.
