I've tested the density of gasoline at fixed temperature for 10 times and the result showed that the density of gasoline increases like linear graph. So, I actually wonder what wrong with it?!
(I poured sample from a big bottom to a small beaker in suitable amount that I had to use in each time then I used syringe sucking that sample into density meter so, air and humidity may be not the affecting factors.)
Gasoline itself is highly volatile and may vaporize at constant temperature. Can you be sure that some of the gasoline did not become vapor in the process of transferring?
The first answer that springs to mind is the one above - you are boiling off the light ends. Perhaps this is happening in the storage vessel. Is this vessel sealed, and what is happening to the room temperature in which you keep the main vessel? Can you get a fresh sample volume and keep this in a sealed metal container in a refrigerator? You then take your sample volume and try to work with it at a constant temperature. Gasoline is highly flammable so please take the necessary precautions.
Rgds
Gasoline is a carefully blended mixture of hydrocarbon compounds that usually have C5 -C12 atoms with a deliberate selection of branched alkanes ,for instance, to raise the octane rating. Branched alkanes generally have lower boiling points than their corresponding linear alkanes. Add to it, the possibility of having some soluble hydrocarbons with C4 atoms within gasoline.
Therefore, there is a high chance of vaporization of the light hydrocarbons during your experiment which led to an increase in density .
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