[Christ]

Lake effect winters up there?

Fuel evaporates no matter how hot it is outside... just like ice cubes left in the freezer over time will get smaller, even though it's cold in there.

Scientifically, what happens to the ice cubes is called "sublimation", and what happens to the gas is called "evaporation". Conceptually, they're both just evaporating though.

It's a very hard thing to explain that things don't have to be perceptually hot for them to evaporate... Liquid nitrogen evaporates at a much lower temp than water does, but even water evaporates when the differential of air temperature to itself is positive.

In other words, if the air temperature is hotter than the body of evaporate mass, the mass will evaporate into it, until 100% saturation occurs.

Therefore, gasoline will evaporate, even at night. It just evaporates faster when the temps rise, until the surrounding air is 100% saturated with fuel vapor, at which point, no further vaporization can occur.

File this into "nit picking" and "splitting hairs".