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At higher temps, gas expands. Being gasoline is highly flamable and evaporates quickly, I can see how the temp would affect the amount of gas coming out. The guy is not saying that if measured at say 90* F and at 32* F, that it will not be exactly 1 gallon. He is simply saying that there is more actual gas in that 1 gallon at 32* than there is at 90*. Its more dense at 32*, therefore less room for air. C'mon guys, simple chemistry.
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