This is also kind of another myth (scientifically not a myth) among the vehicle users. So when we look at the scientific background of this, in the morning the temperature is low in the fuel, so the density of the fuel is bit higher than day time. As you all know,
Volume = Mass/Density
So the volume is a constant (Pumping Gas in Litres), when density increases the mass also increases to keep constant volume.So you have a small advantage with fuel in Kgs as you pump gas in the morning. Why did i express this as myth? This scenario is scientifically correct but practically the vehicle owner has very little advantage with this (Ignorable advantage). You can save few cents with this method but by stopping the engine for few seconds can save more gas than this method.
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